Be a dashing candidate? (3)
I believe the answer is:
run
'be' is the definition.
(running is a kind of being)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for run that I've seen before include "Operate; flow" , "publish" , "Manage; flee" , "Unit of score in cricket" , "freedom of access" .)