Imprisons Catholic girl heartlessly (5)
I believe the answer is:
cages
'imprisons' is the definition.
The answer and definition can be both to do with social activities as well as being verbs in their -s form.
Perhaps you can see an association between them that I can't see?
'catholic girl heartlessly' is the wordplay.
'catholic' becomes 'c' (abbreviation as in RC for Roman Catholic).
'girl heartlessly' becomes 'ages' (I can't justify this - if you can you should give a lot more credence to this answer).
'c'+'ages'='CAGES'
Can you help me to learn more?
(Other definitions for cages that I've seen before include "Locks up" , "prisons" , "Enclosures for animals" , "Wild animal enclosures" , "Enclosures made or wire or metal bars" .)