Sticks in America an advantage with crops (9)
I believe the answer is:
boondocks
'sticks in america' is the definition.
(US term for the countryside ie 'the sticks')
'an advantage with crops' is the wordplay.
'an advantage' becomes 'boon' (both can mean a benefit or asset).
'with' is a charade indicator (letters next to each other).
'crops' becomes 'docks' (both can mean to cut or trim).
'boon'+'docks'='BOONDOCKS'
(Other definitions for boondocks that I've seen before include "Remote inland area" , "dull provincial place" , "American sticks" .)