Manhattan part (3)
I believe the answer is:
rye
'manhattan part' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rye that I've seen before include "Grain - whiskey - port" , "Cereal grass - Sussex Cinque Port" , "Grass - whiskey" , "Hard liquor" , "Cereal grain" .)