9 across
Pocket
tip
and
mostly
split
collection
(9)
Pocket tip and mostly split collection (9)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
Right, so collection at the end is your definition — a mixture or medley of things. Now build it up: "Pocket" gives you POT (as in potting a ball in billiards), "tip" gives you POUR (tipping liquid out), and "split" is RIP, but "mostly" tells you to drop the last letter, leaving RI. String POT, POUR and RI together and you've got your answer.