Favourite place making an impression with good reason (8,6)
I believe the answer is:
stamping ground
'favourite place making an impression' is the definition.
I can't tell whether this defines the answer.
'good reason' is the wordplay.
'good' becomes 'stamping' (I can't explain this - if you can you should believe this answer much more).
'reason' becomes 'ground' (synonyms).
'stamping'+'ground'='STAMPING-GROUND'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for stamping ground that I've seen before include "Resort" , "place one frequents" , "Familiar position" , "seemingly petulant?" , "activity the Post Office?" .)