As good as secured (2,3,3)
I believe the answer is:
in the bag
'as good as secured' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for in the bag that I've seen before include "You'll find game here" , "like cat incapable of ratting?" , "Where mail may be" , "Where you may find tea" , "Informally secured as one wished" .)