Beatles lose wager... and get drinks! (4)
I believe the answer is:
ales
'drinks' is the definition.
(ale is a kind of drink)
'beatles lose wager' is the wordplay.
'lose' indicates named letters should be taken away.
'wager' becomes 'bet' (synonyms).
'beatles' with 'bet' taken out is 'ALES'.
'and get' is the link.
(Other definitions for ales that I've seen before include "Types of beer" , "What might be delivered by pumps" , "Alcoholic drinks" , "A sale of beers" .)