Crazy children’s game needs new beginning (7)
I believe the answer is:
bonkers
'crazy' is the definition.
(I've seen this before)
'children's game needs new beginning' is the wordplay.
I cannot really see how this works, but
'game' could be 'on' (both can mean willing) and 'on' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for bonkers that I've seen before include "Slang for crazy, off the wall" , "bats" , "Completely mad" , "Barmy, crackers" , "touched..." .)