Cooled that hot enthusiast Edward (6)
I believe the answer is:
fanned
'cooled that hot' is the definition.
'fanned' can be an answer for 'cooled' (I've seen this before). I'm unsure of the rest of the definition.
'enthusiast edward' is the wordplay.
'enthusiast' becomes 'fan' (fan is a kind of enthusiast).
'edward' becomes 'Ned'.
'fan'+'ned'='FANNED'
Can you help me to learn more?
(Other definitions for fanned that I've seen before include "Cooled" , "Winnowed" , "Created current of air, as to stimulate fire" , "Ventilated" , "Drove current of air upon, say flame" .)