Significant narration (7)
I believe the answer is:
telling
This clue is a double definition.
'significant' is the first definition.
(I've seen this before)
'narration' is the second definition.
(I know that telling is a type of narration)
(Other definitions for telling that I've seen before include "Revealing, significant" , "Powerful; relating" , "of significance" , "Giving an order" , "Striking, having noticeable effect" .)