Virtuoso lacking power to bring into use (5)

I believe the answer is:

exert

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'bring into use' is the definition.
(to exert is to exercise or use)

I cannot understand how the rest of the clue works.

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(Other definitions for exert that I've seen before include "Put to use, vigorously" , "Bring into play, wield" , "Bring into use, strength or influence" , "Expend" , "Apply (force)" .)

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