A suspended employee is entitled to "subsistence allowance". In order to get this subsistence allowance, he has to submit certificates every month stating that he is not working anywhere. By implication this means that a suspended government employee is free to work and earn money during suspension. He can even join another job. However, in that case he cannot submit the monthly certificates. [If he submits false certificates to get subsistence allowance, and subsequently it is found out that the certificates were false, then it would amount to fraud and cheating - a greater misconduct which may lead to termination even and no advocate will be able to defend you].
However, there is a way to earn money legally even during suspension. First of all, check the language of relevant certificate to be submitted by the suspended employee (You can find it from Civil Service Rules applicable on the employee). Usually, the language is "I hereby certify that during the calendar month of ......., I was not engaged in any other employment, business, profession or vocation." This means that you can earn money in any manner (except through employment, business, profession or vocation). In other words, you can accept "honorarium", "reimbursement" and things like that.
The best course will be to do a work, which does not involve generation of a record (such as doing tuition work, starting trading or other activities in the name of spouse, etc.). REMEMBER - WHERE THERE IS A LAW, THERE IS A LOOPHOLE and WHERE THERE IS A WILL, THERE IS A WAY (or is it "Where there is a will there is a will not also " !.