Dashing in great confusion (7)
I believe the answer is:
tearing
'dashing' is the definition.
(both can mean rushing around)
'in great confusion' is the wordplay.
'confusion' indicates anagramming the letters.
'in'+'great'='ingreat'
'ingreat' with letters rearranged gives 'TEARING'.
(Other definitions for tearing that I've seen before include "splitting" , "violent" , "'Pulling apart, ripping (7)'" , "Granite (anag.)" .)