Impact little (5)
I believe the answer is:
touch
I believe this is a double definition.
'impact' is the first definition.
(I know that impact can be written as touch)
'little' is the second definition.
(eg 'a little too big' means 'a touch too big')
(Other definitions for touch that I've seen before include "spot" , "Pinch" , "Feel - brush" , "Manner of playing piano, say" , "Hint" .)