Hypothetically if footballers could have their wages withheld for an arrest and charge until court / sentencing, the same principle would apply to drink driving charges etc. I really don’t think any agent worth his salt would present a client with a contract that could so easily result in hundreds of thousands of pounds being withheld from them.
Once someone is found guilty of a crime and any suspensions being found to have been reasonable to prevent the employer being brought into disrepute, I would wholly expend any contractual fees paid to be recoverable, especially when the nature of said accusations reasonably prevented the player from fulfilling his contractual obligations.
Until such time he’ll be getting paid the vast majority of his contract.