Crossword Genius

Stuart queen is turning brown (6)

Ross

I believe the answer is:

sienna

'brown' is the definition.
(I've seen this before)

'stuart queen is turning' is the wordplay.
'stuart queen' becomes 'anne' (I've seen this before).
'turning' is a reversal indicator.
'anne'+'is'='anneis'
'anneis' reversed gives 'SIENNA'.

(Other definitions for sienna that I've seen before include "yellowy-brown" , "Earthy colour" , "reddish brown" , "Earth colour containing ferric oxides used as a pigment" , "Italian city and brownish pigment" .)

I've seen this clue in The Times.
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