Work in a factory (3)

I believe the answer is:

act

'work' is the definition.
(synonyms)

'in a factory' is the wordplay.
'in' indicates a hidden word.
'ACT' is hidden within 'factory'.

(Other definitions for act that I've seen before include "Routine" , "performing group" , "Feat" , "Do something, in a play?" , "A deed or statute" .)

I've seen this clue in the Evening Standard.

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