Open, as a sleeping bag (6)
I believe the answer is:
unroll
'open as a sleeping bag' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for unroll that I've seen before include "strike off the list for Shakespeare" , "go straight" , "Dismantle the joint, perhaps" , "Unfurl" , "Gradually reveal" .)