Working poet I rave about (9)
I believe the answer is:
operative
'working' is the definition.
('operative' can be a synonym of 'working')
'poet i rave about' is the wordplay.
'about' indicates an anagram.
'poet'+'i'+'rave'='poetirave'
'poetirave' with letters rearranged gives 'OPERATIVE'.
(Other definitions for operative that I've seen before include "Worker in manufacturing" , "Functioning; worker" , "Efficient" , "secret agent" , "Machinist - working" .)