Mock as you start scurrying away (5)
I believe the answer is:
scoff
'mock' is the definition.
(scoff can mean to mock or tease)
'you start scurrying away' is the wordplay.
I cannot quite understand how this works, but
'start' could be 'off' (as in 'from the off') and 'off' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'as' acts as a link.
Can you help me to learn more?
(Other definitions for scoff that I've seen before include "Quickly swallow" , "Speak contemptuously or drink informally" , "Greedily consume" , "Mock" , "Ridicule - guzzle" .)