Marks the wrong section (7)
I believe the answer is:
notices
'marks' is the definition.
(I know this)
'wrong section' is the wordplay.
'wrong' is an anagram indicator.
'section' anagrammed gives 'NOTICES'.
'the' acts as a link.
(Other definitions for notices that I've seen before include "Discovers" , "Remarks upon publicly displayed informations" , "Observers in section" , "Section (anag) - spots" , "Perceives, sees" .)