Forward by Tuesday (4)

I believe the answer is:

pert

'forward' is the definition.
(thesaurus)

'by tuesday' is the wordplay.
'by' becomes 'per'.
'tuesday' becomes 't'.
'per'+'t'='PERT'

(Other definitions for pert that I've seen before include "Saucy and chipper" , "Saucy and impudent" , "Slightly insolent" , "Jaunty" , "Persian expert" .)

I've seen this clue in the Evening Standard.

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