During turmoil, operatives return to quell horrible virus (5)
I believe the answer is:
polio
'quell horrible virus' is the definition.
I can't judge whether this definition defines the answer.
'during turmoil operatives return' is the wordplay.
'during' says the answer is hidden in the clue.
'return' says the letters should be written backwards.
'oilop' is hidden within 'turmoil operatives'.
'oilop' reversed gives 'POLIO'.
'to' is the link.
Can you help me to learn more?
(Other definitions for polio that I've seen before include "rarely seen complaint" , "Paralysing disease" , "Acute viral disease" , "Viral disease which can cause paralysis ( 5)" , "Viral disease causing paralysis" .)