Little sprint (4)
I believe the answer is:
dash
This clue is a double definition.
'little' is the first definition.
(a dash is a small amount)
'sprint' is the second definition.
(I know that sprint can be written as dash)
(Other definitions for dash that I've seen before include "rats" , "If you're smart, you'll cut one" , "Short line; run" , "style" , "Dart" .)