Crossword Genius

Observe a sound (4)

Ross

I believe the answer is:

note

This clue is a double definition.

'observe' is the first definition.
(synonyms)

'a sound' is the second definition.
(thesaurus)

(Other definitions for note that I've seen before include "Pay attention to; record" , "Record; memo" , "held by piano teacher" , "Make a record of" , "register" .)

I've seen this clue in The Mirror.
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