Chilling pair at heart of horror (1,3,1)
I believe the answer is:
r and r
This clue might be a double definition.
'chilling pair' is the first definition.
The definition suggests a singular noun which matches the answer.
'heart of horror' is the second definition.
The definition suggests a singular noun which matches the answer.
'at' acts as a link.
Can you help me to learn more?
(Other definitions for r and r that I've seen before include "A break from continuous service" , "relaxation" .)