New scale for shoestrings (5)
I believe the answer is:
laces
'shoestrings' is the definition.
(I've seen this before)
'new scale' is the wordplay.
'new' indicates an anagram.
'scale' anagrammed gives 'LACES'.
'for' is the link.
(Other definitions for laces that I've seen before include "Scale for shoe fasteners" , "Cords for fastening shoes" , "Shoestrings" , "Cords for tying shoes" , "Scale for boot fasteners" .)