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' says to put 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" .)