Plasters interior, setting off alarms (6)
I believe the answer is:
alerts
'off alarms' is the definition.
'alerts' can be an answer for 'alarms' ('alert' can be a synonym of 'alarm'). I'm unsure of the 'off' bit.
'plasters interior setting' is the wordplay.
'interior' indicates the central letters.
'setting' is an anagram indicator.
The centre of 'plasters' is 'laster'.
'laster' with letters rearranged gives 'ALERTS'.
Can you help me to learn more?
(Other definitions for alerts that I've seen before include "Draws attention to, a danger perhaps" , "Alarms, warning signals" , "Puts on guard, warns about impending danger" , "danger-signals" , "Puts on guard, forewarns" .)