Iron Chancellor spoilt Ma's brick (8)
I believe the answer is:
bismarck
'iron chancellor' is the definition.
(synonyms)
'spoilt ma's brick' is the wordplay.
'spoilt' is an anagram indicator.
'mas'+'brick'='masbrick'
'masbrick' with letters rearranged gives 'BISMARCK'.
(Other definitions for bismarck that I've seen before include "We sank it, May 1941" , "The Iron Chancellor" , "Famous German" , "North Dakota's capital" , "Otto von -, nineteenth century German politician" .)