It's applied with experience (4)

I believe the answer is:

used

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'it's applied' is the definition.
('use' can be a synonym of 'apply')

I don't understand the rest of the clue.

(Other definitions for used that I've seen before include "Employed in task, or second-hand" , "taken advantage of!" , "not got directly" , "worked unfairly" , "was milking" .)

I've seen this clue in The Globe and Mail.

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