Minute particle (4)
'minute particle' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for atom that I've seen before include "type of bomb" , "Moat (anag.)" , "Tiny bit" , "Minute particle" , "An explosive particle as in bomb" .)
'minute particle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for scintilla that I've seen before include "Tiny, scarcely detectable amount" , "The smallest amount" , "scrap!" , "Tiny trace or amount" , "Slight amount" .)