Sisters admit nothing being proper perhaps (5)
I believe the answer is:
nouns
'proper perhaps' is the definition.
I can't judge whether this definition defines the answer.
'sisters admit nothing' is the wordplay.
'sisters' becomes 'nuns' (I've seen this in another clue).
'admit' is an insertion indicator.
'nothing' becomes 'O' (O resembles 0).
'nuns' going around 'o' is 'NOUNS'.
'being' is the link.
Can you help me to learn more?
(Other definitions for nouns that I've seen before include "Naming words" , "They refer to people, places and things" , "Words used as names of person, place or thing" , "They can be used to refer to persons, places or things" , "Words that can be the subject or object of a verb" .)