Conclude there's no end for fire (7)
I believe the answer is:
inferno
'fire' is the definition.
(I've seen this before)
'conclude there's no end' is the wordplay.
'conclude' becomes 'infer' (inferring is a kind of concluding).
'there's' becomes 'n' (I've seen this in other clues).
'end' suggests the final letters.
The final letter of 'no' is 'o'.
'infer'+'n'+'o'='INFERNO'
'for' is the link.
(Other definitions for inferno that I've seen before include "Uncontrollable fire" , "Great fire" , "Intense and uncontrolled fire" , "Fierce fire" , "A raging fire like hell" .)