Coming into hectic canteen, surrender priority (11)
I believe the answer is:
antecedence
'priority' is the definition.
(antecedence is a kind of priority)
'coming into hectic canteen surrender' is the wordplay.
I cannot really understand how this works, but
'surrender' could be 'cede' (synonyms) and 'cede' is found within the answer.
an anagram of 'canteen' is 'antence' which is within the left over letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for antecedence that I've seen is " Priority".)