Cry heard at Wimbledon, possibly referring to the balls? (7)

I believe the answer is:

gonadal

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

'wimbledon possibly referring to the balls?' is the definition.
I can't tell whether this defines the answer.

'cry heard at' is the wordplay.
I cannot quite see how this works, but
'at' could be 'on' (location) and 'on' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.

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