Drops exhortation to depart (4,2)
I believe the answer is:
lets go
This clue could be a double definition.
'drops' is the first definition.
The definition and answer can be both to do with contact as well as being verbs in their -s form.
Perhaps they are linked in a way I don't understand?
'exhortation to depart' is the second definition.
(let us go)
Can you help me to learn more?
(Other definitions for lets go that I've seen before include "fires" , "Releases from one's grip" , "Order to leave" , "Come on then, we're off!" , "Liberates" .)