Hardhearted pros pains... (5)
I believe the answer is:
aches
This clue might be a double definition.
'hardhearted pros' is the first definition.
Although both the answer and definition are plural nouns, I can't see how they can define each other.
'pains' is the second definition.
(ache is a kind of pain)
Can you help me to learn more?
(Other definitions for aches that I've seen before include "Hurts; yearns" , "Gives a dull pain" , "Pains, hurts" , "sign of suffering" , "Dull prolonged pains" .)