Small bit of paint (5)
(Other definitions for fleck that I've seen before include "Speckle" , "Small patch of colour" , "Little spot" , "Small patch of colour/light" , "A bit of colouring" .)
(Other definitions for dab that I've seen before include "A bad sort of little fish" , "Press gently; flatfish" , "A small fish - bad one" , "Bad sort of small fish" , "Touch gently - fingerprint" .)