Complete drink with endless ale (5)
I believe the answer is:
'complete' is the definition.
'drink with endless ale' is the wordplay.
'drink' becomes 'tot' (a small alcoholic drink).
'with' means one lot of letters go next to another.
'endless' means to remove the last letter.
'ale' with its final letter removed is 'al'.
(Other definitions for total that I've seen before include "Not qualified" , "Final tally" , "Complete, absolute" , "Ruin" , "wreck" .)