Mirror put back together again without any silvering initially (8)
I believe the answer is:
resemble
'mirror' is the definition.
(mirror can mean to resemble or look like)
'back together again without any silvering initially' is the wordplay.
I cannot quite see how this works, but
'again' could be 're' (prefix meaning 'again') and 're' is present in the answer.
The remaining letters 'semble' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'put' acts as a link.
Can you help me to learn more?
(Other definitions for resemble that I've seen before include "Look like (someone/something)" , "Appear like another person" , "Have similarities to" , "Look similar to" , "Have a similar appearance to (another)" .)