Marks the broken section (7)
I believe the answer is:
notices
'marks' is the definition.
('notice' can be a synonym of 'mark')
'the broken section' is the wordplay.
'the broken' is an anagram indicator.
'section' anagrammed gives 'NOTICES'.
(Other definitions for notices that I've seen before include "reviews" , "Pays attention" , "Discovers" , "Section (anag) - spots" , "advertisements" .)