Grains sprinkled on American drink (7)
I believe the answer is:
sangria
'drink' is the definition.
(sangria is a kind of drink)
'grains sprinkled on american' is the wordplay.
'sprinkled' is an anagram indicator (the letters are sprinkled around).
'on' indicates putting letters inside (as in clothing \'on\' a person).
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'grains' is an anagram of 'sngria'.
'sngria' placed around 'a' is 'SANGRIA'.
(Other definitions for sangria that I've seen before include "Spanish wine punch" , "Spanish wine/fruit drink" , "Spanish alcoholic drink" , "Drink - Iran gas (anag)" , "Spanish sweetened wine drink" .)