Rush to arrange heats (5)
I believe the answer is:
haste
'rush' is the definition.
(synonyms)
'arrange heats' is the wordplay.
'arrange' indicates anagramming the letters.
'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" .)