How steeplejack might be paid to sweat? (8)

I believe the answer is:

perspire

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'to sweat?' is the definition.
('perspire' can be a synonym of 'sweat')

I can't explain the remainder of the clue.

(Other definitions for perspire that I've seen before include "Swelter" , "Exude" , "Sweat (as a lady does?)" , "Sweat politely" , "for every shoot" .)

I've seen this clue in The Times.

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