Last amulet, it has broken (8)
I believe the answer is:
ultimate
'last' is the definition.
(similar in meaning)
'amulet it has broken' is the wordplay.
'has broken' indicates an anagram (I've seen this in other clues).
'amulet'+'it'='amuletit'
'amuletit' is an anagram of 'ULTIMATE'.
(Other definitions for ultimate that I've seen before include "Furthest, final" , "Mutilate in final way" , "Best or most extreme" , "Conclusive" , "The last element of a series" .)