deleteing attribute

Hello, I want to delete an attribute I send to NASes in Access-reply, regardless of its value. Apparently I cannot use '!*' operator which is only for check items, and '-=' doesn't support wilcards (unless i mistaken) How can I do it? Am using freeradius 2.1.6 on Debian x86_64 P.S: of course I can't change the attributes returned in the authorized section. :)