Crossword Genius

Against sudden speeding up of a new children’s game (4-1)

Ross

I believe the answer is:

anti-g

I'm a little stuck... Click here to teach me more about this clue!

'against sudden speeding up' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'a new children's game' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is located in the answer.
'game' could be 'tig' (playground game) and 'tig' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

'of' is the link.

Can you help me to learn more?

(Another definition for anti-g that I've seen is " Designed to reduce effects of high acceleration".)

I've seen this clue in The Times.
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