Chaste person of virtue tucking into meat (6)
I believe the answer is:
vestal
'chaste' is the definition.
(similar in meaning)
'person of virtue tucking into meat' is the wordplay.
'person of virtue' becomes 'st' (abbreviation for saint).
'tucking into' indicates putting letters inside.
'meat' becomes 'veal' (veal is a kind of meat).
'st' inserted within 'veal' is 'VESTAL'.
(Other definitions for vestal that I've seen before include "Like virgins of old" , "Fat for candles/soap" , "Consecrated Roman virgin" , "Woman dedicated to celibacy" , "Valets for old Roman virgin" .)