Busy pub talk is essentially quite ordinary (5)

I believe the answer is:

usual

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'quite ordinary' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for usual that I've seen before include "Normally done" , "In accordance with regular practice" , "regarding customs?" , "Typically done" , "Common or garden" .)

I've seen this clue in The Guardian.

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