Notice I intended to limit chapter's importance (12)
I believe the answer is:
Here is my best explanation:
'importance' is the definition.
(significance is a kind of importance)
'notice i intended to limit chapter's' is the subsidiary indication.
'notice' becomes 'sign' (**).
'intended' becomes 'fiance' (I've seen this before).
'to limit' is an insertion indicator.
'chapter' becomes 'c'.
'fiance' placed around 'c' is 'ficance'.
(Other definitions for significance that I've seen before include "Importance, meaning", "Import", "Meaning" and "weight".)