Go the fast way, being smart (3)
I believe the answer is:
fly
This could be a double definition.
'go the fast way' is the first definition.
'fly' can be an answer for 'go' (flying is a kind of going). I'm unsure of the 'the fast way' bit.
'being smart' is the second definition.
(fly can informally mean smart or well-dressed)
Can you help me to learn more?
(Other definitions for fly that I've seen before include "needs to get away" , "Insect; move quickly" , "Dipterous insect" , "House insect" , "Aviate" .)