Cereal with degree of hotness (5)
I believe the answer is:
wheat
'cereal' is the definition.
(I know that wheat is a type of cereal)
'with degree of hotness' is the wordplay.
I cannot quite see how this works, but
'with' could be 'w' (short for with) and 'w' is found within the answer.
'hotness' could be 'heat' (synonyms) and 'heat' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for wheat that I've seen before include "Cereal crop" , "Grain crop" , "Cereal grain" , "Cereal plant" , "Cereal for bread/pasta" .)