Disappear from cave, seen going astray (8)
I believe the answer is:
evanesce
'disappear' is the definition.
(I've seen this before)
'cave seen going astray' is the wordplay.
'going astray' indicates an anagram.
'cave'+'seen'='caveseen'
'caveseen' with letters rearranged gives 'EVANESCE'.
'from' is the link.
(Other definitions for evanesce that I've seen before include "Fade away" , "Fade quickly from sight" , "Shimmering" , "Seen cave (anag) -- disappear gradually" .)