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Unwise Trump-Biden clash spilling first blood (9)

Ross

I believe the answer is:

imprudent

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'unwise' is the definition.
(similar in meaning)

I cannot understand how the rest of the clue works.

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(Other definitions for imprudent that I've seen before include "not wise" , "Without forethought" , "Rash, lacking discretion" , "Lacking in good sense or caution" , "'making the wrong choices'?" .)

I've seen this clue in the Sydney Morning Herald.
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