Unruly peer after cold food (5)
I believe the answer is:
crepe
'food' is the definition.
(crepe is a kind of food)
'unruly peer after cold' is the wordplay.
'unruly' indicates anagramming the letters.
'after' says to put letters next to each other.
'cold' becomes 'c' (eg on taps).
'peer' with letters rearranged gives 'repe'.
'repe' put after 'c' is 'CREPE'.
(Other definitions for crepe that I've seen before include "Crinkled paper or fabric" , "Flat French food" , "Soft thin fabric with a crinkled surface" , "Thin twenty four Ac" , "Light wrinkled fabric" .)