It's not fair for one to use this (8)

I believe the answer is:

umbrella

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'it's not fair for one to use this' 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 umbrella that I've seen before include "Rain protector" , "Gamp" , "Portable, protective canopy" , "Aegis" , "requirement in poor weather" .)

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

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