I'm held in scorn, turning red (7)
I believe the answer is:
crimson
'red' is the definition.
(I know that red can be written as crimson)
'i'm held in scorn turning' is the wordplay.
'held in' indicates putting letters inside.
'turning' indicates anagramming the letters.
'scorn' with letters rearranged gives 'crson'.
'im' going into 'crson' is 'CRIMSON'.
(Other definitions for crimson that I've seen before include "Bright red" , "Shade of red" , "Ruddy" , "Deep red colour" , "Become red-faced" .)