A contemptuous person roughly upended lover in play (8)
I believe the answer is:
cressida
'lover in play' is the definition.
'cressida' can be an answer for 'lover' (I have seen 'Lover of Troilus ' mean 'cressida' so perhaps 'lover' could also mean 'cressida'). I am not certain of the 'in play' bit.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for cressida that I've seen before include "Lover of Troilus (Shakespeare)" , "Titled lady" , "Shakerspeare play ''Troilus and ........''" , "Trojan lover" , "See 17" .)