A short talk by Greek hero (4)
I believe the answer is:
ajax
'greek hero' is the definition.
(I've seen this before)
'a short talk by' is the wordplay.
'short talk' becomes 'ja' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'by' becomes 'x' (multiplication sign).
'a'+'ja'+'x'='AJAX'
Can you help me to learn more?
(Other definitions for ajax that I've seen before include "Old war hero" , "Swiftest Greek warrior in the Trojan War who killed himself" , "Ancient Greek hero" , "Amsterdam football team" , "It's quite often seen in loo" .)