Teeny (6)
'teeny' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for minute that I've seen before include "Very small, like unit of time" , "Exact" , "Short period of time" , "Barely perceptible" , "barely noticeable?" .)
(Other definitions for minuscule that I've seen before include "Fine" , "Not important" , "not capital" , "A lower-case letter" , "Extremely small, tiny" .)