Crossword Genius

Word spoken by Caesar before child's game (7)

Ross

I believe the answer is:

venison

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

'game' is the definition.
(I know that venison is a game)

'word spoken by caesar before child's' is the wordplay.
I cannot really see how this works, but
'child' could be 'son' (male child) and 'son' is found within the answer.
The remaining letters 'veni' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for venison that I've seen before include "Flesh of deer" , "Game" , "Deer (as food)" , "Type of meat" , "Meat - in ovens (anag)" .)

I've seen this clue in The Guardian.
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