’E tucked into girl’s meat (4)
I believe the answer is:
veal
'meat' is the definition.
(veal is a kind of meat)
''e tucked into girl's' is the wordplay.
'tucked into' means one lot of letters goes inside another.
'girl' becomes 'val' (short for Valerie**).
'e' inserted inside 'val' is 'VEAL'.
(Other definitions for veal that I've seen before include "what the meat course may be" , "White meat" , "Calf flesh" , "Calf meat" , "Calf's flesh as food" .)