Pruner, it aggravated itching (8)
I believe the answer is:
prurient
'itching' is the definition.
(thesaurus)
'pruner it aggravated' is the wordplay.
'aggravated' indicates anagramming the letters.
'pruner'+'it'='prunerit'
'prunerit' with letters rearranged gives 'PRURIENT'.
(Other definitions for prurient that I've seen before include "Morbidly interested in sexual matters" , "Given to lewd thoughts" , "Morbidly interested in sex" , "Turn ripe (anag) - lewd" , "Bawdy" .)