Hearing part where water drains when spending penny (7)
I believe the answer is:
lughole
'water drains when spending penny' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'hearing part' is the wordplay.
I cannot really understand how this works, but
'part' could be 'hole' (hole is a kind of part) and 'hole' is located in the answer.
The remaining letters 'lug' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'where' acts as a link.
Can you help me to learn more?
(Other definitions for lughole that I've seen before include "Organ with which to 15 (slang)" , "Ear (slang)" , "Ear (informal)" .)