A quick note (5)

I believe the answer is:

sharp

I believe this is a double definition.

'a quick' is the first definition.
(thesaurus)

'note' is the second definition.
(thesaurus)

(Other definitions for sharp that I've seen before include "British musician" , "Acidic; note" , "Keen - exactly" , "needing strings slackened?" , "woman's name in Vanity Fair" .)

I've seen this clue in the Evening Standard.

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