Final drink, after getting keys (7)
I believe the answer is:
decider
'final' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I can't see?
'drink after getting keys' is the wordplay.
'drink' becomes 'cider' (cider is a kind of drink).
'after getting' says to put letters next to each other.
'keys' becomes 'de' (I've seen this in other clues).
'cider' put after 'de' is 'DECIDER'.
Can you help me to learn more?
(Other definitions for decider that I've seen before include "Last game after a draw" , "Extra period of play to settle a draw" , "It settles an outcome" , "crucial match" , "Ultimate goal" .)