Permission to chop veal with energy (5)
I believe the answer is:
leave
'permission' is the definition.
(leave is permission or authorisation)
'chop veal with energy' is the wordplay.
'chop' indicates an anagram (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'energy' becomes 'e' (physics symbol as in E=mc2).
'veal' anagrammed gives 'leav'.
'leav'+'e'='LEAVE'
'to' is the link.
(Other definitions for leave that I've seen before include "Deposit" , "Skip" , "Permission to go; allow to remain" , "Go (5)" , "Relinquish - holiday" .)