Staggering, installing new sunshade (6)

I believe the answer is:

awning

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'sunshade' is the definition.
(synonyms)

I don't understand the rest of the clue.

(Other definitions for awning that I've seen before include "It keeps sun and rain off a shop window" , "Canvas sunshield" , "Protection" , "Shade over shop window" , "Shop front cover" .)

I've seen this clue in The Times.

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