Confrontation expected by Labour leader (4)
I believe the answer is:
duel
'confrontation' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'expected by labour leader' is the wordplay.
'expected' becomes 'due' (similar in meaning).
'by' says to put letters next to each other.
'labour leader' becomes 'l' (the leading letter of 'labour').
'due'+'l'='DUEL'
Can you help me to learn more?
(Other definitions for duel that I've seen before include "Contest to settle point of honour" , "Fight over a point of honour" , "Prearranged fight with deadly weapons between two people" , "Potentially fatal fight between two people" , "Contest between two with deadly weapons" .)