Musical notation written on a stave to indicate pitch of the following notes (4)

I believe the answer is:

clef

(Other definitions for clef that I've seen before include "Musical pitch indicator" , "symbol used by 6 [VERDI]" , "Symbol on a stave to show the pitch" , "Musical key or stave" , "Sign of (musical) pitch" .)

I've seen this clue in The Guardian.

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