English short of oriental coins at first? Ridiculous! (9)

I believe the answer is:

senseless

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'ridiculous' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for senseless that I've seen before include "Unconscious; stupid" , "Without reason" , "Wildly foolish" , "Silly" , "Out cold" .)

I've seen this clue in The Guardian.

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