Where to flog horse mounted by earl (4)
I believe the answer is:
ebay
'where to flog' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'horse mounted by earl' is the wordplay.
I cannot really see how this works, but
'horse' could be 'bay' (bay is a kind of horse) and 'bay' is present in the answer.
'earl' could be 'e' and 'e' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for ebay that I've seen before include "Online market" , "Auction site" , "Modern marketplace" , "Electronic marketplace" , "Website" .)