Badly restored Yankee ship (9)
I believe the answer is:
destroyer
'ship' is the definition.
(destroyer is a kind of ship)
'badly restored yankee' is the wordplay.
'badly' is an anagram indicator (letters in the wrong order).
'yankee' becomes 'Y' (phonetic alphabet: alpha, bravo, charlie etc.).
'restored'+'y'='restoredy'
'restoredy' with letters rearranged gives 'DESTROYER'.
(Other definitions for destroyer that I've seen before include "Saboteur" , "Naval vessel" , "HMS" , "One who wrecks" , "Small, fast warship" .)