Fittingly test (3,2)

I believe the answer is:

try on

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'test' is the definition.
(try-on is a kind of test)

I don't understand how the rest of the clue works.

(Other definitions for try on that I've seen before include "Test suitability" , "Check the fit of (a garment)" , "attempted deception" , "Attempt at deception" , "Test a garment's size and look" .)

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

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