Small portion (3)
There are a few possibilities for this:
'small portion' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dab that I've seen before include "Gently wipe" , "Bad sort of small fish" , "Expert; flatfish" , "Lightly press" , "A small fish - bad one" .)
'small portion' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tot that I've seen before include "slug?" , "Youngster; short drink" , "Small measure for a small child" , "Child; measure of spirits" , "An arithmetic babe?" .)
'small portion' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bit that I've seen before include "Small quantity or piece of metal for a horse" , "Small piece; boring tool" , "scrap" , "A little coin" , "'Part, fragment (3)'" .)
'small portion' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tad that I've seen before include "A small amount (colloq.)" , "little boy" , "Small amount or degree" , "Small bit" , "Smidgen" .)