Insulate round the bend without a tool (7)
I believe the answer is:
utensil
'tool' is the definition.
(I've seen this in another clue)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for utensil that I've seen before include "A kitchen pot or pan" , "Let us in (anag) -- implement" , "knife, maybe" , "E.g. colander" , "Tool for practical use" .)