Contemplate announcing a comeback facilitated by this (9)
I believe the answer is:
reflector
'a comeback facilitated by this' is the definition.
The definition suggests a singular noun which matches the answer.
'contemplate announcing' is the wordplay.
'contemplate' becomes 'reflect' (synonyms).
'announcing' becomes 'or' (I can't justify this - if you can you should believe this answer much more).
'reflect'+'or'='REFLECTOR'
Can you help me to learn more?
(Other definitions for reflector that I've seen before include "Newton saw through this" , "One thinking" , "telescope" , "I think" , "Eg, cat's eye" .)