Place in legal document being held back (7)
I believe the answer is:
delayed
'held back' is the definition.
(delaying is a kind of holding back)
'place in legal document' is the wordplay.
'place' becomes 'lay' (synonyms).
'in' is an insertion indicator.
'legal document' becomes 'deed' (deed is a kind of legal document).
'lay' going inside 'deed' is 'DELAYED'.
'being' is the link.
(Other definitions for delayed that I've seen before include "Protracted" , "Caused to be held up" , "Deferred, postponed" , "Made late" , "Shelved" .)