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As an actor, a very good sandwich-man

Ross

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'man' is the definition.
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(Other definitions for ham that I've seen before include "This actor overacts" , "one rescued from flood" , "One of Noah's sons" , "(Cooked or cured) thigh of pig" , "Succulent meat or extravagant actor" .)

I've seen this clue in the Evening Standard.
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