Crossword Genius

Charged with sex game (2,3,2)

Ross

I believe the answer is:

up for it

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

'game' is the definition.
(I've seen this before)

'charged with sex' is the wordplay.
I cannot quite understand how this works, but
'sex' could be 'it' (a common euphemism) and 'it' is found within the answer.
The remaining letters 'upfor' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for up for it that I've seen before include "Ready to take part" , "Game" , "Enthusiastic" .)

I've seen this clue in The Guardian.
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