Battered sword in house (7)
I believe the answer is:
windsor
'house' is the definition.
(royal house)
'battered sword in' is the wordplay.
'battered' is an anagram indicator.
'sword'+'in'='swordin'
'swordin' with letters rearranged gives 'WINDSOR'.
(Other definitions for windsor that I've seen before include "town near Eton" , "Barbara" , "Town with royal castle" , "Family name replacing Saxe-Coburg-Gotha in 1917" , "Royal house (or castle)" .)