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Polish guards behave adversely investigating vehicle (5,3)

Ross

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5,3

8*

scout car

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'vehicle' is the definition.
(scout car is a kind of vehicle)

I cannot understand how the remainder of the clue works.

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(Other definitions for scout car that I've seen before include "Military patroller" , "reconnaissance vehicle" , "Fast armoured vehicle" .)

I've seen this clue in The Telegraph.
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