A badly spoilt banger (6)
I believe the answer is:
pistol
'banger' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'a badly spoilt' is the wordplay.
'a badly' indicates an anagram.
'spoilt' with letters rearranged gives 'PISTOL'.
Can you help me to learn more?
(Other definitions for pistol that I've seen before include "Small gun" , "Hand weapon" , "Small firearm" , "Type of gun" , "Shakespearean - weapon" .)