Not a problem when antiperspirant is used (2,5)

I believe the answer is:

no sweat

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'not a problem' is the definition.

I can't explain the remainder of the clue.

(Other definitions for no sweat that I've seen before include "Not a problem! (informal)" , "That won't be a problem" , "That's not a problem!" , "easily done" , "Not a problem (US colloq.)" .)

I've seen this clue in The Daily Express.

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