Iota
(Other definitions for tad that I've seen before include "A small amount (colloq.)" , "(A) bit, touch" , "Little bit" , "little boy" , "Smidgen" .)
'iota' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for jot that I've seen before include "Write a short note" , "Small piece - note" , "Write hastily - a very small amount" , "Write hurriedly" , "Set down briefly" .)
'iota' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for modicum that I've seen before include "A small amount as of drink" , "Little bit" , "A small portion" , "Mum, I cod about a small amount" , "I cod Mum into providing a small quantity" .)
'iota' is the definition.
(I know that iota can be written as smidge)
This is all the clue.
(Other definitions for smidge that I've seen before include "very small part" , "Really tiny amount" .)
'iota' is the definition.
(synonyms)
This is all the clue.
(Other definitions for scintilla that I've seen before include "Slight amount" , "Tiniest bit" , "Tiny hint, trace" , "A tiny bit" , "Tiny, scarcely detectable amount" .)
'iota' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for atom that I've seen before include "A mighty particle, can be explosive" , "A mighty particle, makes huge explosion" , "An explosive particle as in bomb" , "Piece of matter in moat" , "Tiny particle, causes mighty explosion" .)
'iota' is the definition.
(I know that iota can be written as whit)
This is all the clue.
(Other definitions for whit that I've seen before include "Very small part - Christian festival" , "Very small amount" , "smallest bit imaginable" , "Pentecost (abbrev.)" , "The smallest amount" .)
'iota' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for speck that I've seen before include "Tiny spot" , "Small particle" , "Small spot" , "Small mark" , "Dot" .)