Tarnished instead, sadly (7)
I believe the answer is:
Here is my best explanation:
'tarnished' is the definition.
('stained' can be a synonym of 'tarnished')
'instead sadly' is the subsidiary indication.
'sadly' is an anagram indicator.
'instead' with letters rearranged gives 'stained'.
(Other definitions for stained that I've seen before include "Church feature - side sold was wanting (anag)", "Marked, discoloured", "Soiled", "___ glass", "Like many church windows" and "Discoloured".)