Sender of unwanted emails (7)
I believe the answer is:
spammer
'sender of unwanted emails' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for spammer that I've seen before include "His unwanted messages" , "Person sending unsolicited emails" , "Unwanted e-mail sender" , "Sender of junk e-mails" , "He sends out junk" .)