Show it's duck meat (6)
I believe the answer is:
'show it's' is the definition.
I can't judge whether this defines the answer.
'duck meat' is the wordplay.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'meat' becomes 'liver' (liver is a kind of meat).
'o'+'liver'='OLIVER'
Can you help me to learn more?
(Other definitions for oliver that I've seen before include "One taking pride in food", "Orphan recruited by criminal gang", "A Cromwell, a Twist", "Musical from Dickens novel", "Cromwell, for example".)