I'm held in scorn, turning bright red (7)
I believe the answer is:
crimson
'bright red' is the definition.
(I've seen this before)
'i'm held in scorn turning' is the wordplay.
'held in' indicates putting letters inside.
'turning' is an anagram indicator.
'scorn' is an anagram of 'crson'.
'im' placed inside 'crson' is 'CRIMSON'.
(Other definitions for crimson that I've seen before include "Vivid red" , "Bright red" , "Shade of red" , "Microns of colour" , "Rich deep red" .)