21 across
Musical
stagehand’s
lock
retainer
(8)
Musical stagehand’s lock retainer (8)
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The definition is at the end of the clue.
How the clue works
Lock retainer is your definition, since it's something that holds a lock of hair in place. You get there by taking HAIR — the famous musical — and adding GRIP, which is what you call a stagehand in theatre or film.