Gibson in the part of Hamlet, possibly? (3)

I believe the answer is:

mel

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'gibson' is the definition.
Both the answer and definition are singular nouns.
Maybe there's a link between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for mel that I've seen before include "- - Gibson (actor)" , "Honey" , "-- Brooks, film director" .)

I've seen this clue in the Evening Standard.

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