Backs “Contretemps” (8)
I believe the answer is:
reverses
'backs' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for reverses that I've seen before include "Goes back with reserves" , "Setbacks" , "Defeats" , "Goes backwards" , "Moves backwards" .)