Scuttle, scamper (6)
I believe the answer is:
scurry
I believe this is a double definition.
'scuttle' is the first definition.
(I know that scuttle can be written as scurry)
'scamper' is the second definition.
(I know that scamper can be written as scurry)
(Other definitions for scurry that I've seen before include "Move quickly" , "Move hurriedly" , "short horse race" , "Scamper" , "Dash (like a mouse?)" .)