Hates organising qualifiers (5)
I believe the answer is:
heats
'qualifiers' is the definition.
(I've seen this in another clue)
'hates organising' is the wordplay.
'organising' indicates anagramming the letters.
'hates' anagrammed gives 'HEATS'.
(Other definitions for heats that I've seen before include "Eliminating rounds of a race" , "Haste (anag.)" , "Eliminating rounds in a contest" , "Makes hot or warm" , "Warms up for the preliminary races" .)