Some of Barnet gang joining obstruction (7)
I believe the answer is:
ringlet
'some of barnet' is the definition.
The definition suggests a singular noun which matches the answer.
'gang joining obstruction' is the wordplay.
'gang' becomes 'ring' ('ring' can be a synonym of 'gang').
'joining' is a charade indicator (letters next to each other).
'obstruction' becomes 'let' (I've seen this in other clues).
'ring'+'let'='RINGLET'
Can you help me to learn more?
(Other definitions for ringlet that I've seen before include "Hair feature" , "twist of sorts?" , "Hair curl, of an Irish dancer perhaps" , "sort of lock" , "A long tubular curl" .)