He comes to no conclusion in legend (8)
I believe the answer is:
immortal
'legend' is the definition.
(thesaurus)
'he comes to no conclusion' is the wordplay.
I cannot quite see how this works, but
'he' could be 'mort' and 'mort' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for immortal that I've seen before include "Great person" , "Moral Tim (anag.)" , "Enduring" , "Imperishable" , "never to be forgotten" .)