Someone who carries drink? (6)
I believe the answer is:
porter
'someone' is the definition.
(porter is a kind of someone)
'who carries drink?' is the wordplay.
'who' becomes 'er' (I am not sure about this - if you are sure you should believe this answer much more).
'carries' is a charade indicator (letters next to each other) (in a down clue, some letters go beneath others).
'drink?' becomes 'port' (port is a kind of drink).
'er' put after 'port' is 'PORTER'.
Can you help me to learn more?
(Other definitions for porter that I've seen before include "Bag carrier in hotel or railway station" , "Dark sweet ale" , "Baggage-handler" , "Hospital worker; beer" , "Hotel luggage carrier" .)