Great selection of beers to pitch (6)
I believe the answer is:
ground
'to pitch' is the definition.
(thesaurus)
'great selection of beers' is the wordplay.
'great' becomes 'G' (abbreviation in place names).
'selection of beers' becomes 'round' (I am not sure about this - if you are sure you should believe this answer much more).
'g'+'round'='GROUND'
Can you help me to learn more?
(Other definitions for ground that I've seen before include "turned to dust" , "territory" , "Terrain" , "The solid surface of the Earth" , "foundation course?" .)