A couple of outworkers (3)

I believe the answer is:

two

'a couple' is the definition.
(I've seen this before)

'of outworkers' is the wordplay.
'of' indicates a hidden word.
'TWO' can be found hidden inside 'outworkers'.

(Other definitions for two that I've seen before include "eg Twins" , "Number of Gentlemen of Verona" , "Couple, brace" , "not very many" , "Duo" .)

I've seen this clue in the Evening Standard.

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