Postponed, put down in document (7)
I believe the answer is:
delayed
'postponed' is the definition.
(similar in meaning)
'put down in document' is the wordplay.
'put' becomes 'lay' (as in laying or putting something down).
'down in' is an insertion indicator.
'document' becomes 'deed' (deed is a kind of document).
'lay' inserted within 'deed' is 'DELAYED'.
(Other definitions for delayed that I've seen before include "Shelved" , "Hindered" , "Held up, back" , "Put back" , "Protracted" .)