Fire ghost mysteriously appears in vision (9)
I believe the answer is:
foresight
'vision' is the definition.
(I've seen this before)
'fire ghost mysteriously' is the wordplay.
'mysteriously' indicates anagramming the letters.
'fire'+'ghost'='fireghost'
'fireghost' with letters rearranged gives 'FORESIGHT'.
'appears in' acts as a link.
(Other definitions for foresight that I've seen before include "Planning" , "Power of prediction" , "Ability to anticipate" , "Clairvoyance" , "Prescience" .)