In a funny way, Eric imitates Bill (5)

I believe the answer is:

sykes

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

I don't understand the rest of the clue.

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(Another definition for sykes that I've seen is " sitcom".)

I've seen this clue in the Evening Standard.

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