English guy heard message (5)
I believe the answer is:
'message' is the definition.
(email is a type of message)
'english guy heard' is the wordplay.
'english' becomes 'E' (abbreviation).
'guy' becomes 'male'.
'heard' indicates a 'sounds like' (homophone) clue.
'male' is a homophone of 'mail'.
'e'+'mail'='EMAIL'
(Other definitions for email that I've seen before include "Spam perhaps" , "Send one online" , "Internet-borne communication" , "Messages between computer terminals" , "Messages via the internet" .)