Who's enemy of drink in Denmark? (5)
I believe the answer is:
dalek
'who's enemy' is the definition.
(the Daleks are enemies in the TV show Doctor Who)
'drink in denmark?' is the wordplay.
'drink' becomes 'ale' (type of beer).
'in' means one lot of letters goes inside another.
'denmark?' becomes 'dk'.
'ale' put inside 'dk' is 'DALEK'.
'of' is the link.
(Other definitions for dalek that I've seen before include "Talking robot" , "SF villain" , "Dr Who enemy" , "Doctor Who creature" , "Doctor Who monster" .)