Incursions and raids on Barking (7)
I believe the answer is:
inroads
'incursions' is the definition.
(inroad is a kind of incursion)
'raids on barking' is the wordplay.
'barking' indicates an anagram (UK slang for mad).
'raids'+'on'='raidson'
'raidson' is an anagram of 'INROADS'.
'and' acts as a link.
(Other definitions for inroads that I've seen before include "advances" , "Sad iron (anag.)" , "Progress" , "raid" , "Hostile incursions" .)