Doze (off) (3)
I believe the answer is:
nod
'doze off' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nod that I've seen before include "Drop the head" , "Incline the head" , "Cain left Eden for the Land of . . ." , "Doze" , "Show assent" .)