Crossword Genius

Move calf off boundaries of football ground (4)

Ross

I believe the answer is:

oval

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

'ground' is the definition.
(cricket ground)

'move calf off boundaries of football' is the wordplay.
I cannot quite understand how this works, but
'of' could be 'o' and 'o' is found in the answer.
The remaining letters 'val' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for oval that I've seen before include "It's egg-shaped for cricketers" , "Shaped like an egg" , "Ashes Test venue" , "not quite round" , "Cricket ground - presidential office" .)

I've seen this clue in the Sydney Morning Herald.
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