Spa sponge (5)
I believe the answer is:
loofa
'spa sponge' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for loofa that I've seen before include "Flesh-brush" , "back-scratcher?" , "Gourd used as a sponge" , "Bathroom sponge" , "Fruit used for a sponge" .)