Tap defect (3)

I believe the answer is:

bug

I believe this clue is a double definition.

'tap' is the first definition.
(synonyms)

'defect' is the second definition.
(bug is a kind of defect)

(Other definitions for bug that I've seen before include "Irritate" , "It's snug in a rug (3)" , "Insect or defect in a computer program" , "Computer glitch" , "Computer program error" .)

I've seen this clue in The Daily Mail and The Telegraph.

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