One who tries out a canopy (6)

I believe the answer is:

tester

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'canopy' is the definition.
(I know that tester is a type of canopy)

I don't understand the remainder of the clue.

(Other definitions for tester that I've seen before include "One who analyses a bed canopy" , "A canopy over a large bed, or an examiner" , "Person examining" , "Kind of examiner or bed canopy" , "One sampling; four-poster bed canopy" .)

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

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