Not far from a broken chin (4)
I believe the answer is:
inch
'not far' is the definition.
I can't judge whether this definition defines the answer.
'a broken chin' is the wordplay.
'a broken' indicates anagramming the letters.
'chin' with letters rearranged gives 'INCH'.
'from' is the link.
Can you help me to learn more?
(Other definitions for inch that I've seen before include "Linear measure" , "The island is very small in length" , "Thirty-sixth of yard" , "Move slowly, in small steps" , "A very little" .)