A shopkeeper? Wrong: a mechanic (9)
I believe the answer is:
outfitter
'a shopkeeper?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'wrong a mechanic' is the wordplay.
'wrong' becomes 'out' (eg a calculation might be 'out').
'a mechanic' becomes 'fitter' (I've seen this before).
'out'+'fitter'='OUTFITTER'
Can you help me to learn more?
(Other definitions for outfitter that I've seen before include "Person in shop" , "Seller of men's clothing" , "One dealing in clothing" , "Men's clothing shop" , "who could help in gear selection?" .)