Finger __ (5)
'finger' is the definition.
(I know that finger can be written as digit)
This is the entire clue.
(Other definitions for digit that I've seen before include "One in ten, say" , "One's on hand" , "one of several at hand" , "A small number" , "Single figure - finger" .)
(Other definitions for blame that I've seen before include "Pin fault on (someone)" , "Find fault with" , "Hold (a person) responsible" , "Accuse" , "Censure; culpability" .)
(Other definitions for lakes that I've seen before include "Large bodies of water surrounded by land" , "Bodies of (usually fresh) water" , "Enclosed areas of water" .)