Cynical person has a snack (4-6,3)
I believe the answer is:
hard-boiled egg
'a snack' is the definition.
(I've seen this before)
'cynical person' is the wordplay.
'cynical' becomes 'hard boiled' (I've seen this before).
'person' becomes 'egg' (as in 'a bad egg').
'hardboiled'+'egg'='HARD-BOILED EGG'
'has' is the link.
(Other definitions for hard-boiled egg that I've seen before include "Cooked item provided by 1 down" , "Potential picnic fare" , "Possible picnic item" .)