Pay some more money for it (5)

I believe the answer is:

remit

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'pay' is the definition.
(remitting is a kind of paying)

'some more money for it' is the wordplay.
'some more money for' becomes 'rem' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rem'+'it'='REMIT'

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(Other definitions for remit that I've seen before include "send money, maybe" , "Job specification" , "Scope of reference" , "Maybe suspend" , "Task/area assigned (to an organisation)" .)

I've seen this clue in the Evening Standard.

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