Having swallowed half of loaf, bolt a piece of meat (8)
I believe the answer is:
escalope
'a piece of meat' is the definition.
(I've seen this before)
'having swallowed half of loaf bolt' is the wordplay.
'having swallowed' means one lot of letters goes inside another.
'half of' means to take half the letters.
'bolt' becomes 'escape' (I've seen this before).
'loaf' cut in half is 'lo'.
'lo' put inside 'escape' is 'ESCALOPE'.
(Other definitions for escalope that I've seen before include "food" , "Thin slice of boneless meat" , "Cut of meat" , "Thin piece of meat" , "Thin slice of boneless veal" .)