Name a bad actor about to end an affair (5)
I believe the answer is:
hiram
'end an affair' is the definition.
The definition suggests a singular noun which matches the answer.
'name a bad actor about' is the wordplay.
'name a bad' becomes 'ir' (I am not sure about this - if you are sure you should believe this answer much more).
'actor' becomes 'ham' (ham is a kind of actor).
'about' is an insertion indicator.
'ir' placed into 'ham' is 'HIRAM'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for hiram that I've seen before include "He supplied temple builders" , "I gave Solomon materials for Temple" .)