Reads grid, wrongly showing neglect (9)
I believe the answer is:
disregard
'neglect' is the definition.
(synonyms)
'reads grid wrongly' is the wordplay.
'wrongly' indicates anagramming the letters.
'reads'+'grid'='readsgrid'
'readsgrid' anagrammed gives 'DISREGARD'.
'showing' is the link.
(Other definitions for disregard that I've seen before include "Neglect, ignore" , "Push aside" , "Overlook - inattention" .)