Failure to notice a number of balls put on view (9)
I believe the answer is:
oversight
'failure to notice' is the definition.
(I've seen this before)
'a number of balls put on view' is the wordplay.
'a number of balls' becomes 'over' (cricket term).
'put on' is a charade indicator (letters next to each other).
'view' becomes 'sight' (synonyms).
'over'+'sight'='OVERSIGHT'
(Other definitions for oversight that I've seen before include "error" , "Lapse" , "Neglect" , "Innocent mistake" , "Management" .)