Considered what a mirror did (9)
I believe the answer is:
reflected
'considered' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'a mirror did' is the wordplay.
'a mirror' becomes 'reflect' (mirror can mean to reflect).
'did' becomes 'ed' (I can't justify this - if you can you should give a lot more credence to this answer).
'reflect'+'ed'='REFLECTED'
'what' acts as a link.
Can you help me to learn more?
(Other definitions for reflected that I've seen before include "Like angels" , "Meditated" , "Pondered, contemplated" , "Threw back an image" , "Mirrored - mediated" .)