Crossword Genius

Not all a resting actor needs (4)

Ross

I believe the answer is:

part

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'not all' is the definition.
('part' is the opposite to 'all')

I don't understand the rest of the clue.

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(Other definitions for part that I've seen before include "Piece, segment" , "Piece; divide" , "Sever; portion" , "Constituent - something to play?" , "Portion, segment" .)

I've seen this clue in The Irish News.
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