Barney erupting in the vicinity (6)
I believe the answer is:
nearby
'in the vicinity' is the definition.
('nearby' can be a synonym of 'in the vicinity')
'barney erupting' is the wordplay.
'erupting' indicates an anagram.
'barney' with letters rearranged gives 'NEARBY'.
(Other definitions for nearby that I've seen before include "Just round the corner?" , "[OPPOSITE OF] miles away" , "Around the corner" , "Local" , "In close proximity" .)