Omens disturbed wise man following the party line (2,7)
I believe the answer is:
on message
'following the party line' is the definition.
'omens disturbed wise man' is the wordplay.
'disturbed' is an anagram indicator (the order of letters is disturbed).
'wise man' becomes 'sage' (sage is a kind of wise man).
'omens' with letters rearranged gives 'onmes'.
'onmes'+'sage'='ON-MESSAGE'
(Other definitions for on message that I've seen before include "keeping to the script" , "Following official line" , "in accordance with policy" , "Following party line" , "Reflecting the official line" .)