Calls about trouble with barriers (8)
I believe the answer is:
railings
'barriers' is the definition.
(railing is a kind of barrier)
'calls about trouble' is the wordplay.
'calls' becomes 'rings' ('ring' can be a synonym of 'call'**).
'about' means one lot of letters goes inside another.
'trouble' becomes 'ail' ('ail' can be a synonym of 'trouble').
'rings' going around 'ail' is 'RAILINGS'.
'with' acts as a link.
(Other definitions for railings that I've seen before include "bitter complaints" , "Fences of upright metal bars, often around parks" , "Metal guards" , "Protective barriers" , "Iron bars set into protective fence" .)