Dozing (6)
I believe the answer is:
asleep
'dozing' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for asleep that I've seen before include "In the Land of Nod" , "Please be at rest (6)." , "Knitting up the ravelled sleeve of care" , "out like a light?" , "Like kippers" .)