This may be put on legal documents, we hear (4)
I believe the answer is:
Here is my best explanation:
'this may be put on' is the definition.
'legal documents we hear' is the subsidiary indication.
'legal documents' becomes 'writs' (writ is a kind of legal document).
'we hear' shows a homophone (sound like).
'writs' is a homophone of 'ritz'.
(Other definitions for ritz that I've seen before include "Elegant hotel", "Grand hotel", "Place of expensive luxury", "Luxury hotel", "Cesar --, Swiss hotelier", "Swiss hotelier, creator of a chain of elegant hotels, d. 1918", "Puttin' on the -- (song)", "Ostentatious luxury", "Swiss hotelier, who founded an international chain, d. 1918" and "Stylish establishment".)