Lions living together in sin? (5)
I believe the answer is:
pride
I believe this is a double definition.
'lions living together' is the first definition.
(pride is the collective noun for a group of lions)
'sin?' is the second definition.
(I know that pride is a type of deadly sin)
'in' is the link.
(Other definitions for pride that I've seen before include "conceit" , "Novel by Jane Austen" , "Hubris" , "Company of lions" , "Dignity" .)