Plans to develop great manners (12)
I believe the answer is:
arrangements
'plans' is the definition.
(I've seen this before)
'develop great manners' is the wordplay.
'develop' indicates an anagram.
'great'+'manners'='greatmanners'
'greatmanners' is an anagram of 'ARRANGEMENTS'.
'to' is the link.
(Other definitions for arrangements that I've seen before include "Organisation, disposition" , "orders" , "Plans for a future event" .)