Get-go (5)
I believe this clue is a double definition.
'get' is the first definition.
(thesaurus)
'go' is the second definition.
(I know that go can be written as start)
(Other definitions for start that I've seen before include "Jump suddenly" , "Origin" , "Begin with sudden movement of surprise" , "Jerk" , "Move quickly < when surprised" .)
'get-go' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for onset that I've seen before include "Start - attack" , "Beginning (of disease etc)" , "Initial stage; attack" , "Storming" , "Kick-off" .)
'get-go' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for outset that I've seen before include "Fruit" , "origin" , "Beginning, start" , "debut?" , "Inception" .)