Royal drink returned (5)
I believe the answer is:
regal
'royal' is the definition.
(I know that royal can be written as regal)
'drink returned' is the wordplay.
'drink' becomes 'lager' (lager is a kind of drink).
'returned' shows that the letters should be reversed in order.
'lager' backwards is 'REGAL'.
(Other definitions for regal that I've seen before include "Showing great dignity" , "Grand and imposing" , "Kingly glare?" , "Imperial, majestic" , "Befitting a monarch" .)