Memorandum (4)

I think it could be either:

note

chit

'memorandum' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for note that I've seen before include "Memo; pay attention to" , "Eminence" , "Tenner, for example" , "Comment" , "Tone of importance" .)

I've seen this clue in The Telegraph and the King Feature Syndicate.

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