Loathe terrible heat (4)
I believe the answer is:
hate
'loathe' is the definition.
(I've seen this in another clue)
'terrible heat' is the wordplay.
'terrible' indicates an anagram.
'heat' is an anagram of 'HATE'.
(Other definitions for hate that I've seen before include "Extreme dislike" , "Abominate" , "Despise" , "Odium" , "Antipathy" .)