Artist's range of colours (7)
I believe the answer is:
palette
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">artist's range of colours</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for palette that I've seen before include "Artist's range of colours" , "An artist mixes his paints on it" , "Artist's colour-mixing board" , "selection of colours" , "Painter's utensil" .)