Bully has broken heart: and all fingers and thumbs! (8)
I believe the answer is:
threaten
'bully' is the definition.
(I've seen this before)
'broken heart and all fingers and thumbs' is the wordplay.
'broken' indicates anagramming the letters.
'and' is a charade indicator (letters next to each other).
'all fingers and thumbs' becomes 'ten' (fingers on someone's hands).
'heart' is an anagram of 'threa'.
'threa'+'ten'='THREATEN'
'has' acts as a link.
(Other definitions for threaten that I've seen before include "Utter intentions of injury or punishment" , "Put in jeopardy" , "Impend, portend" , "Put at risk, endanger" , "Menace - impend" .)