Serene bride so perfectly portrayed in the mirror (7)
I believe the answer is:
reposed
'serene' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives occasionally mean the same thing.
'bride so perfectly portrayed in the mirror' is the wordplay.
'in' indicates a hidden word.
'the mirror' is a reversal indicator (I've seen 'mirrored' mean this).
'desoper' is hidden within 'bride so perfectly portrayed'.
'desoper' in reverse letter order is 'REPOSED'.
Can you help me to learn more?
(Other definitions for reposed that I've seen before include "Relaxed" , "Rested" , "What's settled" , "modelled afresh" .)