Going to give them a duck that’s in the oven, cooked (2,3,4)

'going' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I can't see?

'them a duck that's in the oven cooked' is the wordplay.
'a duck' becomes 'o' (resembles zero - 'duck' in cricket).
'that's in the' is an insertion indicator.
'cooked' is an anagram indicator (letters cooked into a new form).
'them'+'o'='themo'
'oven' anagrammed gives 'onve'.
'themo' going within 'onve' is 'ON THE MOVE'.

'to give' is the link.

Can you help me to learn more?