Fibre with a bug (5)

I believe the answer is:

watap

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'fibre' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I don't see?

'with a bug' is the wordplay.
'with' becomes 'w' (abbreviation).
'bug' becomes 'tap' (I've seen this before).
'w'+'a'+'tap'='WATAP'

Can you help me to learn more?

I've seen this clue in The Telegraph.

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