Rush to organise heats (5)
I believe the answer is:
haste
'rush' is the definition.
(I know that rush can be written as haste)
'organise heats' is the wordplay.
'organise' is an anagram indicator.
'heats' anagrammed gives 'HASTE'.
'to' acts as a link.
(Other definitions for haste that I've seen before include "velocity" , "Promptitude" , "More of this proverbially slows you down" , "More of this can slow you up!" , "furious activity" .)