Capacious bag (7)
I believe the answer is:
holdall
'capacious bag' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for holdall that I've seen before include "Large case, with handles" , "Large strong bag with handles or shoulder strap" , "Big bag" , "Bag (contents unlimited?)" , "Large bag (no need for another?)" .)