Milton Keynes etc. very warm? It may be bad news for game! (8)
I believe the answer is:
buckshot
'it may be bad news for game' is the definition.
The definition suggests a singular noun which matches the answer.
'milton keynes etc very warm?' is the wordplay.
I cannot really understand how this works, but
'warm?' could be 'hot' ('hot' can be a synonym of 'warm') and 'hot' is found within the answer.
The remaining letters 'bucks' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for buckshot that I've seen before include "Projectiles for hunting game" , "used in peppering" , "Lead used in hunting" , "ammunition deployed?" , "sort of ammunition" .)