Difference of opinion involving the leader of the council in amendment (11)
I believe the answer is:
altercation
'difference of opinion' is the definition.
(altercation is a kind of difference of opinion)
'the leader of the council in amendment' is the wordplay.
'the leader of' says to take the initial letters.
'in' means one lot of letters goes inside another.
'amendment' becomes 'alteration' (I've seen this before).
The first letter of 'council' is 'c'.
'c' placed into 'alteration' is 'ALTERCATION'.
'involving' is the link.
(Other definitions for altercation that I've seen before include "Spat" , "heated dispute" , "Noisy quarrel" , "difference" , "Squabble" .)