Police returned, requiring corporation to make formal statement (6)
I believe the answer is:
dictum
'formal statement' is the definition.
(a political or legal pronouncement)
'police returned requiring corporation' is the wordplay.
'police' becomes 'cid'.
'returned' shows that the letters should be reversed in order.
'requiring' says to put letters next to each other.
'corporation' becomes 'tum' (I've seen this in other clues).
'cid' backwards is 'dic'.
'dic'+'tum'='DICTUM'
'to make' acts as a link.
(Other definitions for dictum that I've seen before include "Saw" , "Authoritative statement" , "Formal pronouncement" , "Short statement of a general principle" , "firm statement" .)