Crossword Genius

Brief letter (4)

Ross

I believe the answer is:

note

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

This is the entire clue.

(Other definitions for note that I've seen before include "Take this to heed" , "Observe; paper money" , "Put down" , "Short written message" , "Short message; piano key" .)

I've seen this clue in The Independent, The Star Tribune, the Penny Press, The Telegraph and the Newsday.
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