Adjacent parts of steeple vane scenically fade (8)
I believe the answer is:
evanesce
'fade' is the definition.
('evanesce' can be a synonym of 'fade')
'adjacent parts of steeple vane scenically' is the wordplay.
'adjacent parts of' indicates a hidden word.
'EVANESCE' is hidden in the letters of 'steeple vane scenically'.
(Other definitions for evanesce that I've seen before include "Seen cave (anag) -- disappear gradually" , "Fade away" , "Shimmering" , "Fade quickly from sight" .)