Pleasantly smooth or soft (6)
I believe the answer is:
mellow
'pleasantly smooth or soft' is the definition.
(I've seen this before)
This is all the clue.
(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" .)