Intelligence required to frame right legal document (4)
I believe the answer is:
writ
'legal document' is the definition.
(document from a court)
'intelligence required to frame right' is the wordplay.
'intelligence' becomes 'wit' (wit is a kind of intelligence).
'required to frame' is an insertion indicator (some letters are framed by others).
'right' becomes 'r' (common abbreviation).
'wit' enclosing 'r' is 'WRIT'.
(Other definitions for writ that I've seen before include "Legal document of command" , "Legal document, usually served" , "Sealed document" , "Court order document" , "Legal or formal document" .)