Crossword Genius

& 1A Actress who played Ulla in 2016 film drama The Danish Girl (5)

Ross

I believe the answer is:

amber

(Other definitions for amber that I've seen before include "Brownish yellow" , "gives warning" , ""Stop" traffic light" , "Medium to dark brownish-yellow colour" , "Light giving warning" .)

I've seen this clue in The Mirror.
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