Cocktail and meat (not good game) one consumed at PM’s place (10,5)

'consumed at pm's place' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'cocktail and meat not good game one' is the wordplay.
I cannot really see how this works, but
'cocktail' could be 'kir' (I've seen this before) and 'kir' is found in the answer.
'meat' could be 'rib' (rib is a cut of meat) and 'rib' is found in the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
'good' could be 'use' (in phrases like 'it's no good', 'any good?' etc) and 'use' is found within the answer.
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?