Pleasantly smooth or soft (6)
I believe the answer is:
mellow
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pleasantly smooth or soft</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 mellow that I've seen before include "Grown gentle or mild" , "Genial through age" , "Well-matured" , "Soft, cheerful, relaxed" , "Laid-back or pleasantly smooth" .)