Staff's contribution to papers on Nelson (9)
I believe the answer is:
personnel
'staff's' is the definition.
(I've seen this before)
'contribution to papers on nelson' is the wordplay.
'contribution to' indicates a hidden word.
'PERSONNEL' can be found hidden inside 'papers on nelson'.
(Other definitions for personnel that I've seen before include "Staff complement of an organisation" , "Employees collectively" , "Manpower" , "Staff complement of a business" , "Office" .)