Barrier with rope attached (6)
I believe the answer is:
cordon
'barrier' is the definition.
(I've seen this before)
'with rope attached' is the wordplay.
'with' is a charade indicator (letters next to each other).
'rope' becomes 'cord' (I've seen this before).
'attached' becomes 'on' (I've seen this in other clues).
'cord'+'on' is 'CORDON'.
(Other definitions for cordon that I've seen before include "Excellence in cooking is . . . . . . bleu" , "Police line; trained fruit tree" , "Line or circle of guards to prevent access" , "Circle of policemen" , "Line of guard to prevent access" .)