It helps enhance viewers' appearance (7)

I believe the answer is:

mascara

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'it helps enhance viewers' appearance' 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 mascara that I've seen before include "Make-up for eyelashes" , "Cosmetic for darkening the eyelashes" , "Make-up item" , "Makeup used to darken and thicken the eye lashes" , "Type of make-up" .)

I've seen this clue in the Evening Standard.

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