It serves a shady purpose (7)

I believe the answer is:

parasol

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'it serves a shady purpose' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for parasol that I've seen before include "sunblock" , ""Sunbrella"" , "for protection from the elements" , "mushroom" , "Fair-weather umbrella" .)

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