Move fast — fly, for example (3)
I believe the answer is:
zip
This clue could be a double definition.
'move' is the first definition.
(zipping is a kind of moving)
'fly for example' is the second definition.
'zip' can be an answer for 'fly' (both can mean to move quickly). I'm not sure about the 'for example' bit.
'fast' acts as a link.
Can you help me to learn more?
(Other definitions for zip that I've seen before include "Type of fastener" , "Energy or clothes fastener" , "Toothed fastener" , "Locking device with two toothed edges and a sliding tab" , "Nothing < close up" .)