Former breaking heel and wrist (9)
I believe the answer is:
erstwhile
'former' is the definition.
(I know that former can be written as erstwhile)
'breaking heel and wrist' is the wordplay.
'breaking' is an anagram indicator.
'and' says to put letters next to each other.
'heel' after 'wrist' is 'wristheel'.
'wristheel' anagrammed gives 'ERSTWHILE'.
(Other definitions for erstwhile that I've seen before include "Formerly" , "In the past" , "Former - list where (anag)" , "Former, previous" , "Quondam" .)