Rush to arrange heats (5)
I believe the answer is:
haste
'rush' is the definition.
(I've seen this before)
'arrange heats' is the wordplay.
'arrange' is an anagram indicator.
'heats' with letters rearranged gives 'HASTE'.
'to' is the link.
(Other definitions for haste that I've seen before include "Urgent hurry" , "Heats (anag.)" , "Expedition" , "Promptitude" , "Speediness or rush" .)