Having forty winks (8)
'having forty winks' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for snoozing that I've seen before include "Having forty winks" , "Sleeping lightly" , "Dozing" .)
(Other definitions for dozing that I've seen before include "Lightly asleep" , "Sleepy" , "Nodding off" , "Napping" .)