Staff leader? (4)
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I believe the answer is:
clef
'staff leader?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for clef that I've seen before include "Staff symbol" , "Stave character" , "Symbol on a stave to show the pitch" , "Musical key or stave" , "Musical notation on a staff" .)