Moan about drink, say (5)
I believe the answer is:
whine
'moan' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for whine that I've seen before include "Grumble" , "Moan" , "Nagging complaint" , "Complaining cry" , "Gripe" .)