What agents do about gift (9)
I believe the answer is:
represent
'what agents do' is the definition.
The definition suggests a singular noun but the answer is not.
'about gift' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'gift' becomes 'present' (present is a kind of gift).
're'+'present'='REPRESENT'
Can you help me to learn more?
(Other definitions for represent that I've seen before include "Ambassadors do it" , "declare" , "Portray" , "Speak on behalf" , "show" .)