Miami team (4)
I believe the answer is:
'miami team' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for heat that I've seen before include "Energy that caues a rise in temperature" , "Warmth - gossip mag" , "Preliminary race to qualify finalists" , "Provide warmth" , "It's measured in therms" .)