Bring back drink fit for a king (5)
I believe the answer is:
regal
'fit for a king' is the definition.
(I've seen this in another clue)
'bring back drink' is the wordplay.
'bring back' says the letters should be written in reverse.
'drink' becomes 'lager' (lager is a kind of drink).
'lager' written backwards gives 'REGAL'.
(Other definitions for regal that I've seen before include "befitting a king" , "Like a queen?" , "Showing great dignity" , "Royal - lager (anag)" , "fit for the Queen" .)