Mixing clicker training and more traditional gundog training methods can be done.  You will need to follow a few simple rules to avoid confusing your dog. 

One method per skill target.  If you are teaching your dog to sit with a clicker,  set a target you wish to achieve  -  a five second sit for example and stick to clicker training until you have reached your target.  This will allow you and your dog to get the best from the method, it will keep his confidence high, and help you to learn to work the method. Avoid all corrections or aversives of any kind during a clicker session as this will interfere with your dog's willingness to offer changes in behaviour.  Without changes, you cannot modify or improve on what you have - it is the constant changes from which you select and mark the behaviour you desire which allow rapid learning to  take place. 

One method per session.  If you are teaching two skills with different methods  -  for example, a clicker sit plus some traditional heelwork  -  we recommend you keep the sessions separate.  Don't mix the two techniques in one session.   It might not do any harm,  but it makes sense to avoid confusion. 

Clicker training the basics.  A clicker start in life can be very useful especially if you are intent on starting to train a small puppy.  The transition to more traditional methods later on if need be,  should not pose any problems for your dog if he is over five or six months old.  The confidence your early stress free training has given him will stand him in good stead,  and provided you are judicious, moderate and fair in administering any form of aversives or coercion as  you progress to fieldwork,  your dog will not come to any harm.

Clicker training to resolve problems.  Sometimes in training you will come up against a seemingly intractable problem.  Sometimes a clicker solution will help you.   This is particularly so with regard to retrieving problems where any kind of force can put a dog off for good.

Clicker work will benefit your training skills.  All training works by operant conditioning.  Learning to clicker train helps you focus on the factors involved in operant conditioning,  helps you learn how to break skills down into small steps and teaches you to be objective and  patient.

Next  -   Clicker training for gundogs  -  a summary