Bit of a draft? (3)
I believe the answer is:
sip
'bit of a draft?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sip that I've seen before include "A small taste" , "Take small mouthfuls of (drink)" , "Small mouthful of liquid" , "Drink daintily" , "Drink, small mouthful" .)