Canopy becoming evident, though not opening (6)

I believe the answer is:

awning

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'canopy' is the definition.
(awning is a kind of canopy)

I can't explain the remainder of the clue.

(Other definitions for awning that I've seen before include "Shelter over a window" , "Canvas sunshield" , "Canopy of canvas for shelter" , "Shop's sun shade" , "Canvas covering over, say, a patio" .)

I've seen this clue in The Telegraph.

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