Flatter drop of beer, say, at college (6,2)
I believe the answer is:
butter up
'flatter' is the definition.
(buttering up is a kind of flattering)
'drop of beer say at college' is the wordplay.
'drop of' indicates taking the first letters.
'say' becomes 'utter' (I've seen this before).
'at college' becomes 'up'.
The initial letter of 'beer' is 'b'.
'b'+'utter'+'up'='BUTTER UP'
(Other definitions for butter up that I've seen before include "Flatter for a purpose" , "mountain goat?" , "Flatter with milk product?" , "Flatter using common dairy product" , "like 17 [SWEET TALK]" .)