Notice speech habit (9)
I believe the answer is:
addiction
'habit' is the definition.
(I've seen this before)
'notice speech' is the wordplay.
'notice' becomes 'ad'.
'speech' becomes 'diction' (I've seen this before).
'ad'+'diction'='ADDICTION'
(Other definitions for addiction that I've seen before include "Something to kick" , "Obsession" , "The origin of dependence" , "Compulsive habit" , "I did act on (anag.)" .)