Aromatic vein of ore turning up in fissure (8)
I believe the answer is:
redolent
'aromatic' is the definition.
(synonyms)
'vein of ore turning up in fissure' is the wordplay.
'vein of ore' becomes 'lode' (I've seen this before).
'turning up' shows that the letters should be reversed in order.
'in' indicates putting letters inside.
'fissure' becomes 'rent' (both can mean a rip or rift).
'lode' back-to-front is 'edol'.
'edol' inserted into 'rent' is 'REDOLENT'.
(Other definitions for redolent that I've seen before include "Strongly reminiscent (of something)" , "odorous" , "Smelling strongly or suggestive of it" , "Aromatic" , "Strongly suggesting" .)