Crossword Genius

Interrupt a Kerryman glossing over the extent to which it's being availed of (6)

Ross

I believe the answer is:

uptake

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'extent to which it's being availed of' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'interrupt a kerryman glossing over' is the wordplay.
'over' says the answer is hidden in the clue (the clue contains or goes 'over' the answer).
'UPTAKE' is hidden within 'interrupt a kerryman glossing'.

'the' is the link.

Can you help me to learn more?

(Other definitions for uptake that I've seen before include "Grasp one can be quick on" , "understanding" , "Apprehension" , "Acceptance of offer" , "Ability to understand what is meant - some are quick on it" .)

I've seen this clue in The Irish Times.
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