Neglect before line in speech (11)
I believe the answer is:
dereliction
'neglect' is the definition.
(dereliction is a kind of neglect)
'before line in speech' is the wordplay.
'before' becomes 'ere' (usually literary).
'line' becomes 'l'.
'in' is an insertion indicator.
'speech' becomes 'diction' (I've seen this in other clues).
'ere'+'l'='erel'
'erel' put inside 'diction' is 'DERELICTION'.
(Other definitions for dereliction that I've seen before include "Neglect" , "Lack of care" .)