Queen is overthrown and might be burnt (6)
I believe the answer is:
sienna
'might be burnt' is the definition.
(burnt sienna is a shade is a colour)
'queen is overthrown' is the wordplay.
'queen' becomes 'anne' (I've seen this before).
'overthrown' says the letters should be written in reverse.
'anne'+'is'='anneis'
'anneis' backwards is 'SIENNA'.
'and' acts as a link.
(Other definitions for sienna that I've seen before include "-- Sauce; -- toast" , "Brownish-yellow substance used as pigment" , "Earthy paint pigment" , "Yellow-brown pigment" , "Yellow-brown clay used in paint pigments" .)