Oddly roan, with light brown coat and dark brown tinge (7)
I believe the answer is:
caramel
'brown tinge' is the definition.
'caramel' can be an answer for 'brown' (I've seen this before). I'm not certain of the 'tinge' bit.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for caramel that I've seen before include "Shade" , "Chew candy" , "Sugar solution heated till brown" , "It's produced by heating sugar until brown" , "Burnt sugar used for flavouring" .)