Very small record (6)
I believe the answer is:
minute
This clue is a double definition.
'very small' is the first definition.
(I've seen this before)
'record' is the second definition.
(minute is a kind of record)
(Other definitions for minute that I've seen before include "Precise" , "A few ticks" , "Measure of time" , "Occupying very little space" , "Very short or tiny" .)