Very proper (4)
I believe the answer is:
prim
'very proper' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for prim that I've seen before include "Stiffly correct" , "Straitlaced and proper" , "Strait-laced - prudish" , "Prudish, proper" , "Proper (type of rose?)" .)