Be quick to change ends (3)
I believe the answer is:
run
This might be a double definition.
'be quick' is the first definition.
'run' can be an answer for 'be' (running is a kind of being). I'm not sure about the 'quick' bit.
'change ends' is the second definition.
'run' can be an answer for 'change' (running is a kind of changing). I am not sure about the 'ends' bit.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for run that I've seen before include "Flow; function" , "Drive" , "follow a course" , "Manage (eg, a company)" , "escape" .)