I have way to break security device for farm animals (9)
I believe the answer is:
livestock
'farm animals' is the definition.
(I've seen this before)
'i have way to break security device' is the wordplay.
'i have' becomes 'ive'.
'way' becomes 'st'.
'to break' is an insertion indicator.
'security device' becomes 'lock' (I've seen this before).
'ive'+'st'='ivest'
'ivest' inserted into 'lock' is 'LIVESTOCK'.
'for' acts as a link.
(Other definitions for livestock that I've seen before include "(Domestic) animals in general" , "Animals kept for use or profit" , "Farm animals" .)