In melodrama ham actors may well exclaim this (3)
I believe the answer is:
aha
'well exclaim this' is the definition.
The definition suggests a singular noun but the answer is not.
'in melodrama ham actors' is the wordplay.
'in' indicates the answer is hidden within the clue.
'AHA' can be found hidden inside 'melodrama ham actors'.
'may' acts as a link.
Can you help me to learn more?
(Other definitions for aha that I've seen before include "I'm surprised" , "Triumphant cry" , "I've got it!" , "it expresses surprise" , "Palindromic exclamation of triumph or surprise" .)