Notice disguise of consultant (7)
I believe the answer is:
advisor
'consultant' is the definition.
(I know that consultant can be written as advisor)
'notice disguise' is the wordplay.
'notice' becomes 'ad' (both can mean an advertisement).
'disguise' becomes 'visor' (I can't justify this - if you can you should give a lot more credence to this answer).
'ad'+'visor'='ADVISOR'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for advisor that I've seen before include "one counsels" , "Guide; VI roads (anag.)" , "Wise counsellor" , "One recommends" , "One giving counsel (O, not E)" .)