Colour of the spectrum (6)
(Other definitions for orange that I've seen before include "tree" , "An ogre (anag.)" , "shade" , "Dutch royal house" , "Mandarin?" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">colour of the spectrum</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for indigo that I've seen before include "A deep blue dye or colour" , "Blue/violet dye" , "Ellington's Mood" , "Spectral colour" , "Violet dye" .)
(Other definitions for violet that I've seen before include "Seldom" , "It nods on Oberon's bank" , "Colour at opposite end of spectrum from red" , "A flower for a girl" , "Rainbow colour; flower" .)