Drive away, restricting speed initially, then create a stir (5)
I believe the answer is:
roust
'create a stir' is the definition.
'drive away restricting speed initially' is the wordplay.
'drive away' becomes 'rout'.
'restricting' is an insertion indicator.
'initially' suggests taking the first letters.
The first letter of 'speed' is 's'.
'rout' placed around 's' is 'ROUST'.
'then' acts as a link.
(Other definitions for roust that I've seen before include "Rouse, disturb" , "Get out of bed maybe" , "Wake up" , "Stir up (mainly US)" , "Treat roughly - disturb" .)