Crossword Genius

Tributary of the Narew River forming part of the Poland border with both Belarus and Ukraine (3)

Ross

I believe the answer is:

bug

(Other definitions for bug that I've seen before include "Hidden microphone" , "Insect, or flaw in computer program" , "stripped down motor" , "An enthusiast" , "Computer program error" .)

I've seen this clue in The Mirror.
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