Nearly all bed covers left under the table (6)
I believe the answer is:
blotto
'under the table' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for blotto that I've seen before include "Tight" , "Smashed" , "As one plastered" , "Stoned" , "To bolt away slangily drunk" .)