Common sense to enclose right legal document (4)
I believe the answer is:
writ
'legal document' is the definition.
(writ is a kind of legal document)
'common sense to enclose right' is the wordplay.
'common sense' becomes 'wit' (I have seen 'Good sense' mean 'wit' so perhaps 'sense' could also mean 'wit'. I am not sure about the 'common' bit.).
'to enclose' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'wit' placed around 'r' is 'WRIT'.
Can you help me to learn more?
(Other definitions for writ that I've seen before include "Legal injunction" , "official order" , "Legal document, usually served" , "It may be served" , "court paper" .)