The most common and most likely answer to this crossword clue is the 7 letter word CALORIC
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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CALORIC mean?
CALORIC noun- The hypothetical medium of heat.
- Relating to calories.
- Containing calories.
- Relating to calories.
- Relating to or producing heat or other energy.
- (of food) High in calories and thus likely fattening.