Like-minded impact is made on opposition leader (9)
I believe the answer is:
simpatico
'like-minded' is the definition.
(I've seen this in another clue)
'impact is made on opposition leader' is the wordplay.
'made' is an anagram indicator.
'on' means one lot of letters go next to another.
'leader' suggests taking the first letters.
The initial letter of 'opposition' is 'o'.
'impact'+'is'='impactis'
'impactis' is an anagram of 'simpatic'.
'simpatic'+'o'='SIMPATICO'
(Other definitions for simpatico that I've seen before include "Congenial company" , "pleasing" , "Pleasant" , "Likeable, easy to get on with" , "Nice" .)