Bit of toothpaste (3)

I think it could be either:

Which length description are you looking for?:

dab

(Other definitions for dab that I've seen before include "A bad sort of flatfish" , "Apply light touches of colour to the fish" , "Expert; flatfish" , "Digital radio" , "Expert; flat fish" .)

I've seen this clue in the Newsday.

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