Stop repeatedly — sick getting exposed, that’s very cruel (8)
I believe the answer is:
barbaric
'very cruel' is the definition.
(I've seen this before)
'stop repeatedly sick getting exposed that's' is the wordplay.
'stop' becomes 'bar' (I've seen this before).
'repeatedly sick getting' becomes 'bar' (I can't explain this - if you can you should believe this answer much more).
'exposed' says to take the centre (outside letters removed).
'that's' becomes 'which's'.
The middle letters of 'whichs' are 'ic'.
'bar'+'bar'+'ic'='BARBARIC'
Can you help me to learn more?
(Other definitions for barbaric that I've seen before include "Rabbi car for rough and uncivilised" , "Savagely cruel" , "Wild and savage" , "Uncivilized" , "lacking in refinement" .)