earachefl, if you want to take this to court, be my guest. You will lose but it might teach you to next time read and suggest changes to the lease when you do not understand something. All of this could have been avoided by either not signing the lease in its present form, or asking that an amendment to the lease be made to specify for what (if anything) the 'deposit' would be used.
In researching some cases to see what turned up on this issue (none, as noted), I did learn that Florida is pretty strict when it comes to enforcing leases as written. Specifically, there was a 1998 case where the tentant knowingly signed a lease, despite their claim that part of it was illegible. The court held the legal principle of "too bad, so sad" applied and held them bound to it. (
Baker v. Deigert, 724 So. 2d 634, if anyone cares). So, ignoring general contract principles, the little case law there is also supports BB's replies entirely.