Ignore grids: read novel (9)
I believe the answer is:
disregard
'ignore' is the definition.
(I know that ignore can be written as disregard)
'grids read novel' is the wordplay.
'novel' indicates an anagram (letters in a new or novel order).
'grids'+'read'='gridsread'
'gridsread' with letters rearranged gives 'DISREGARD'.
(Other definitions for disregard that I've seen before include "Neglect, ignore" , "Overlook - inattention" , "Push aside" .)