Used pure wit to put on record (5-2)
I believe the answer is:
write-up
'record' is the definition.
(thesaurus)
'used pure wit to put on' is the wordplay.
'used' indicates anagramming the letters.
'to put on' means one lot of letters go next to another.
'pure'+'wit'='purewit'
'purewit' anagrammed gives 'WRITE-UP'.
(Other definitions for write-up that I've seen before include "Report, account" , "Report (of an event)" , "Published account of something or review" , "Pure wit (anag.)" , "Describe fully" .)