Throw together just half the gamblers banks abandoned on Irish ship (6)

I believe the answer is:

jumble

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'throw together' is the definition.
(I know that throw together can be written as jumble)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for jumble that I've seen before include "Hodgepodge" , "Mix up (second-hand items?)" , "Confused mixture (in a sale?)" , "Mix up; items for sale" , "Untidy mess" .)

I've seen this clue in The Irish Times.

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