No indication of disapproval for immoral behaviour in other than the clergy (5)
I believe the answer is:
laity
'clergy' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for laity that I've seen before include "Non-clerical people" , "part of church" , "They're not the clergy" , "Non-clergy" , "Non-specialists" .)