Rather badly stained (7)
I believe the answer is:
instead
'rather' is the definition.
('instead' can be a synonym of 'rather')
'badly stained' is the wordplay.
'badly' indicates anagramming the letters.
'stained' is an anagram of 'INSTEAD'.
(Other definitions for instead that I've seen before include "As a substitute" , "for a change" , "In lieu" , "Rather - detains (anag)" , "as an alternative option" .)