Letter by which you hear from some female (1-4)
I believe the answer is:
'letter' is the definition.
(I have seen 'Electronic letter ' mean 'e-mail' so perhaps 'letter' could also mean 'e-mail')
'which you hear from some female' is the wordplay.
I cannot really understand how this works, but
'from' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
'some' could be 'a' and 'a' is present in the answer.
The remaining letters 'mil' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'by' is the link.
Can you help me to learn more?
(Other definitions for e-mail that I've seen before include "Correspondence sent via internet" , "Electronic epistle" , "Messages between computer terminals" , "Message sent via computer" , "Electronic letter" .)