In tropical, oriental parts there’s some heat! (7)
I believe the answer is:
calorie
'some heat' is the definition.
(amount of heat energy)
'in tropical oriental parts' is the wordplay.
'in' says the answer is hidden in the clue.
'CALORIE' can be found hidden inside 'tropical oriental parts'.
'there's' acts as a link.
(Other definitions for calorie that I've seen before include "generating a bit of heat" , "Food energy unit" , "Oil race (anag)" , "Unit of heat energy" , "Unit of heat (concerned with diet)" .)