Artist to fold over papers quickly (7)
I believe the answer is:
rapidly
'quickly' is the definition.
(I know that quickly can be written as rapidly)
'artist to fold over papers' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'to fold' becomes 'ply' (I've seen this before).
'over' is an insertion indicator.
'papers' becomes 'ID' (identifying documents are one's 'papers').
'ply' placed around 'id' is 'pidly'.
'ra'+'pidly'='RAPIDLY'
(Other definitions for rapidly that I've seen before include "Quickly" , "Fast" , "right off the bat" , "With great speed" , "Speedily" .)