Preschooler (3)
'preschooler' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tot that I've seen before include "Arithmetic for infant" , "Add; small child" , "Add; young child" , "Add up, aggregate" , "Small drink of spirits" .)
(Other definitions for roe that I've seen before include "Fish eggs; small deer" , "Lobster's ripe ovary" , "Caviar" , "Swift runner" , "A mass of fish-eggs" .)