In which your coin may be lost? (4)
I believe the answer is:
slot
'in which your coin' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'may be lost?' is the wordplay.
'may' indicates anagramming the letters (I've seen 'might' mean this (I've seen this in other clues)).
'lost' anagrammed gives 'SLOT'.
Can you help me to learn more?
(Other definitions for slot that I've seen before include "Space for inserting coin" , "Hole for money" , "Long narrow aperture" , "Narrow opening, for cash say" , "Long narrow slit" .)