A bone from Munster? (7)
I believe the answer is:
sternum
'a bone' is the definition.
(the breastbone)
'from munster?' is the wordplay.
'from' indicates an anagram (from the letters).
'munster' with letters rearranged gives 'STERNUM'.
(Other definitions for sternum that I've seen before include "Breastbone" , "Chest bone" , "Munster (anag.)" , "big bone" , "somewhere in chest" .)