He may consider Macbeth unmentionable (5)

I believe the answer is:

actor

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'he may consider macbeth unmentionable' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is all the clue.

Can you help me to learn more?

(Other definitions for actor that I've seen before include "Thesp" , "One on stage" , "One in a play" , "I pretend" , "Films/stage worker" .)

I've seen this clue in the Evening Standard.

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