Weird new adage in docket (6)
I believe the answer is:
agenda
'docket' is the definition.
(synonyms)
'weird new adage' is the wordplay.
'weird' indicates an anagram.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'n'+'adage'='nadage'
'nadage' with letters rearranged gives 'AGENDA'.
'in' acts as a link.
(Other definitions for agenda that I've seen before include "Meet to discuss this" , "Item list for meeting" , "List of items for discussion at a meeting" , "things to discuss" , "Individual objective(s)" .)