Better talk after email is hacked (10)
I believe the answer is:
ameliorate
'better' is the definition.
(to ameliorate is to make better)
'talk after email is hacked' is the wordplay.
'talk' becomes 'orate' (to orate is to give a speech).
'after' says to put letters next to each other.
'is hacked' indicates an anagram (I've seen 'hacking' mean this).
'email' with letters rearranged gives 'ameli'.
'orate' after 'ameli' is 'AMELIORATE'.
(Other definitions for ameliorate that I've seen before include "Make (a bad thing) better" , "Make (something) better" , "seen to improve" , "Become better" .)