Crossword Genius

Ring to check about transport going to West Ham (7)

Ross

I believe the answer is:

overact

'ham' is the definition.
(ham can mean to overact)

I cannot understand how the rest of the clue works.

(Other definitions for overact that I've seen before include "Ham (on stage)" , "Play (part) in an exaggerated manner" , "Cartoon twenty four across" , "Exaggerate" , "Be excessive like fulsome thespian" .)

I've seen this clue in The Independent.
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