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