Group punching glib country fan (7)
I believe the answer is:
patriot
'country fan' is the definition.
(a patriot is a lover or fan of their country)
'group punching glib' is the wordplay.
'group' becomes 'trio' (a group of three).
'punching' indicates putting letters inside (some letters punch a hole in others).
'glib' becomes 'pat' (synonyms).
'trio' going inside 'pat' is 'PATRIOT'.
(Other definitions for patriot that I've seen before include "Chauvinist" , "One with a strong love of country" , "A lover of fatherland" , "Loyalist" , "A trip to (anag.)" .)