Use a straw? (4)
I believe the answer is:
suck
'use a straw?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for suck that I've seen before include "Absorb" , "Imbibe" , "Behave like Hoover, perhaps" , "Use lips and mouth to create a partial vacuum" , "Don't blow!" .)