Drank up a round behind the others (6)
I believe the answer is:
lapped
'drank up' is the definition.
'lapped' can be an answer for 'drank' (lapping is a kind of drinking). I am not certain of the 'up' bit.
'a round behind the others' is the wordplay.
'a round' becomes 'lap' (as in a round or lap of a park).
'behind' is a charade indicator (letters next to each other).
'the others' becomes 'ped' (I can't explain this - if you can you should believe this answer much more).
'lap'+'ped'='LAPPED'
Can you help me to learn more?
(Other definitions for lapped that I've seen before include "Circuited" , "Washed or flowed against" , "Made extra circuit" , "Overtaken by someone a circuit ahead" , "Drank" .)