Plug is averted, somehow (9)
I believe the answer is:
Here is my best explanation:
'plug' is the definition.
'is averted somehow' is the subsidiary indication.
'somehow' is an anagram indicator.
'isaverted' with letters rearranged gives 'advertise'.
(Other definitions for advertise that I've seen before include "Draw attention to, goods for sale perhaps", "Publicise, call attention to", "Praise - plug", "Promote, publicise", "Varied set (anag.)", "Publicize, call attention to", "Publicise, make known", "Call public attention to", "Market" and "Make public what is for sale".)