Under cover (6)
'under cover' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for indoor that I've seen before include "Suited to confines of a building" , "Within the house" , "Appropriate for use within building" , "Situated inside" , "Situated within a building - maybe a sport" .)
'under cover?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for abed that I've seen before include "Not yet risen" , "sleeping? Apparently" , "in his hammock awaiting Santa?" , "Sleeping under covers" , "Not yet up (archaic)" .)