One looking after merry Andrew? (6)
I believe the answer is:
warden
'one looking' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'merry andrew?' is the wordplay.
'merry' indicates an anagram (merry can mean drunk).
'andrew' with letters rearranged gives 'WARDEN'.
'after' acts as a link.
Can you help me to learn more?
(Other definitions for warden that I've seen before include "Andrew, strangely, is in prison" , "Head of certain schools, colleges, etc" , "Title of officer with supervisory duties, perhaps in prison" , "Governor of the Cinque Ports has this title" , "College head" .)