Pale mauve colour (5)
I believe the answer is:
lilac
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pale mauve colour</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 lilac that I've seen before include "Pale mauve colour for a flower" , "Shade" , "Shrub with fragment purple or white flowers" , "Flowering tree of the olive family" , "Shrub (but not always this colour)" .)