Crossword Genius

Show it's duck meat (6)


I believe the answer is:

I'm a little stuck... Click here to teach me more about this clue!

'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).

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".)