Kittens' stretcher (6)
I believe the answer is:
litter
I believe this clue is a double definition.
'kittens'' is the first definition.
(I've seen this before)
'stretcher' is the second definition.
(I've seen this before)
(Other definitions for litter that I've seen before include "Untidy refuse for animal young" , "Offspring of a multiple birth" , "Discarded rubbish" , "dropped by louts?" , "Pups - bedding - stretcher" .)