Raring to go (3,3)
'raring to go' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for all set that I've seen before include "Everything ready to go - like cool jelly?" , "Informally ready to start" , "Everybody ready, like moulded jelly" , "Informally ready, as jelly may be" , "Ready to begin, like hardened jelly?" .)