Certifier of deeds (6)
I believe the answer is:
notary
'certifier of deeds' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for notary that I've seen before include "Certifier of deeds etc." , "Official working on legal documents" , "Legal functionary" , "Public official, usually a solicitor" , "Person who may certify legal documents" .)