Pale mauve (5)
I believe the answer is:
lilac
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pale mauve</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 lilac that I've seen before include "Shrub (but not always this colour)" , "Purplish in colour" , "Lavender colour" , "Light-purple" , "Light purple - shrub" .)