Story about king causes disagreement (8)
I believe the answer is:
friction
'disagreement' is the definition.
(I've seen this before)
'story about king' is the wordplay.
'story' becomes 'fiction'.
'about' means one lot of letters goes inside another.
'king' becomes 'r' (r is abbreviation for rex).
'fiction' going around 'r' is 'FRICTION'.
'causes' acts as a link.
(Other definitions for friction that I've seen before include "Conflict between people who rub each other the wrong way" , "State of conflict, clash" , "Retarding factor - discord" , "Disagreement" , "animosity" .)