See about shelter, being ready for bed (6)
I believe the answer is:
sleepy
'ready for bed' is the definition.
(I've seen this in another clue)
'see about shelter' is the wordplay.
'see' becomes 'spy' (spy can mean to see or observe).
'about' indicates putting letters inside.
'shelter' becomes 'lee' (as in lee side, the side sheltered from wind).
'spy' enclosing 'lee' is 'SLEEPY'.
'being' acts as a link.
(Other definitions for sleepy that I've seen before include "(Of place) low in activity" , "Drowsy - without excitement" , "Feeling like having a snooze" , "Doc's nodding pal" , "One of the Seven Dwarfs" .)