Smart old Pence slammed paper (6)

I believe the answer is:

dapper

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

'old pence slammed paper' is the wordplay.
'old pence' becomes 'd' (I can't justify this - if you can you should believe this answer much more).
'slammed' is an anagram indicator.
'paper' with letters rearranged gives 'apper'.
'd'+'apper'='DAPPER'

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(Other definitions for dapper that I've seen before include "Neat and smart in appearance" , "Of man, neat and smart" , "Smart; jaunty" , "Debonair" , "Spruce in bearing" .)

I've seen this clue in The Sun.

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