Tiny amounts (6)
'tiny amounts' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for traces that I've seen before include "Vestiges (that may be kicked over?)" , "Sketches the outline of" , "Just detectable amounts" , "Tracks down or outlines" , "Kick these over to be insubordinate or reckless" .)
'tiny amounts' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for iotas that I've seen before include "Jots, very small amounts" , "Tiny scraps" , "Tiny amounts" .)