Rest? One may be needed during it (5)

I believe the answer is:

break

'rest?' is the definition.
(resting is a kind of breaking)

I don't understand the rest of the clue.

(Other definitions for break that I've seen before include "Shatter; respite" , "Shatter; interval" , "Holiday - destroy" , "Vacation; snap" , "Better opportunity" .)

I've seen this clue in The Times.

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