Sharp and stimulating (5)
I believe the answer is:
brisk
'sharp and stimulating' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for brisk that I've seen before include "Bustling" , "Vigorous" , "Lively, invigorating" , "Quick, active, energetic" , "Spry" .)