Oxford pursuing heroin? It’s nailed on (9)
I believe the answer is:
horseshoe
'oxford' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'pursuing heroin? it's nailed on' is the wordplay.
'pursuing' is a charade indicator (letters next to each other).
'heroin?' becomes 'horse' ('horse' can be a synonym of 'heroin').
'it's nailed on' becomes 'shoe' (I can't explain this - if you can you should believe this answer much more).
'horse' next to 'shoe' is 'HORSESHOE'.
Can you help me to learn more?
(Other definitions for horseshoe that I've seen before include "One could be lucky" , "Steed's footwear" , "Crab" , "Shore hose (anag.)" , "What a farrier provides" .)