Heat making airmen toil (10)
I believe the answer is:
eliminator
'heat' is the definition.
(I've seen this before)
'making airmen toil' is the wordplay.
'making' is an anagram indicator.
'airmen'+'toil'='airmentoil'
'airmentoil' is an anagram of 'ELIMINATOR'.
(Other definitions for eliminator that I've seen before include "Marine toil (anag) - it gets rid of something" , "Hitman" , "Heat" .)