Sultan's food getting cool (7)
I believe the answer is:
saladin
'sultan's' is the definition.
(12th-century sultan)
'food getting cool' is the wordplay.
I cannot quite understand how this works, but
'food' could be 'salad' (salad is a kind of food) and 'salad' is found within the answer.
'cool' could be 'in' ('in' can mean fashionable or cool) and 'in' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for saladin that I've seen before include "Saracen leader" , "Opponent of the crusaders" , "Richard's opponent" , "Richard the Lionheart's Crusade opponent" , "Sultan who fought the Crusaders" .)