See the ACE Security Guide - Chapter 2. You need to set a CiscoAVPair. How you do this will depend on the RADIUS software that you are using. It sounds like you're being put into Network-Monitor role by default. Quote from the manual:
"The user profile attribute serves an important configuration function for a RADIUS server group. If the user profile attribute is not obtained from the server during authentication, or if the profile is obtained from the server but the context name(s) in the profile do not match the context in which the user is trying to log in, a default role (Network-Monitor) and a default domain (default-domain) are assigned to the user if the authentication is successful."
There are postings in this and other Cisco fora about exactly how to set these values (which depends on your RADIUS server implementation).
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