Crossword Genius

Quick to knock papers (5)

Ross

I believe the answer is:

rapid

'quick' is the definition.
('rapid' can be a synonym of 'quick')

'knock papers' is the wordplay.
'knock' becomes 'rap' ('rap' can be a synonym of 'knock').
'papers' becomes 'id' (identification papers).
'rap'+'id'='RAPID'

'to' is the link.

(Other definitions for rapid that I've seen before include "Speedy (5)" , "Express" , "Electrical connector" , "Waterway where the current runs very fast" , "Fast, quick" .)

I've seen this clue in The Mirror.
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