Nothing certain after party politician displays unease (12)
I believe the answer is:
discomposure
'unease' is the definition.
(thesaurus)
'nothing certain after party politician' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'certain' becomes 'sure' ('sure' can be a synonym of 'certain').
'after' is a charade indicator (letters next to each other).
'party' becomes 'disco' (I've seen this before**).
'politician' becomes 'mp'.
'o'+'sure'='osure'
'disco'+'mp'='discomp'
'osure' put after 'discomp' is 'DISCOMPOSURE'.
'displays' is the link.
(Other definitions for discomposure that I've seen before include "Upset" , "unease" .)