Something to eat at home alone? Not entirely (4)
I believe the answer is:
meal
'something to eat' is the definition.
(some food)
'home alone? not entirely' is the wordplay.
'not entirely' indicates the answer is hidden within the clue.
'MEAL' is hidden within 'home alone'.
'at' is the link.
(Other definitions for meal that I've seen before include "Edible part of grain or pulse" , "Ground grain or pulses" , "Breakfast, dinner or supper" , "Eg, dinner or tea" , "Eg, lunch" .)