Speak sharply (4)
'speak sharply' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for snap that I've seen before include "game of cards" , "Quick photograph - impression" , "that's a copy!" , "Spell of cold weather and card game" , "Break with a crack" .)
(Other definitions for bark that I've seen before include "Ship" , "Protective covering of woody stems" , "Tree-skin or dog noise" , "Skin of tree" , "Cry of a dog or fox" .)