One that milkmaid sits on at dance is game (9)
I believe the answer is:
stoolball
'is game' is the definition.
(I've seen this before)
'one that milkmaid sits on at dance' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
'on' could be 'to' and 'to' is present in the answer.
'dance' could be 'ball' (ball is a kind of dance) and 'ball' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for stoolball that I've seen is " Game".)