Tarnished instead, sadly (7)
I believe the answer is:
stained
'tarnished' is the definition.
(synonyms)
'instead sadly' is the wordplay.
'sadly' indicates an anagram.
'instead' anagrammed gives 'STAINED'.
(Other definitions for stained that I've seen before include "Church feature - side sold was wanting (anag)" , "Marked, discoloured" , "___ glass" , "Like many church windows" , "Soiled" .)