Give off (heat) (7)
I believe the answer is:
radiate
'give off heat' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for radiate that I've seen before include "A tirade (anag)" , "Beam brightly, spread heat" , "broadcast" , "Travel from centre in all directions" , "Emit rays; diverge" .)