Intimidate heart-broken figure (8)
I believe the answer is:
threaten
'intimidate' is the definition.
(intimidate can mean to scare or threaten)
'heart-broken figure' is the wordplay.
'broken' indicates anagramming the letters.
'figure' becomes 'ten' (ten is a number or figure).
'heart' anagrammed gives 'threa'.
'threa'+'ten'='THREATEN'
(Other definitions for threaten that I've seen before include "State an intention to harm" , "Be menacing" , "Give warning of something unpleasant" , "Cow" , "Menace, warn of intention to harm" .)