Recognise that labour leader has advantage - information (9)
I believe the answer is:
knowledge
'information' is the definition.
(I've seen this before)
'recognise that labour leader has advantage' is the wordplay.
'recognise' becomes 'know' (know can mean to recognise someone).
'that labour leader' becomes 'l' (the leading letter of 'labour').
'has' says to put letters next to each other.
'advantage' becomes 'edge' (having the edge is having an advantage).
'know'+'l'+'edge'='KNOWLEDGE'
(Other definitions for knowledge that I've seen before include "Cognition, wisdom" , "Information, learning or enlightenment" , "Info" , "Result of learning - awareness" , "Information - erudition" .)