Thick cord (4)
I believe the answer is:
rope
'thick cord' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rope that I've seen before include "Master of Suspense directed it" , "Give a man enough . . . . and he'll hang himself" , "Cable, cord, hawser" , "String of pearls, say" , "Money for old . . . . Is easily earned" .)