Obstruction case involving rugby player from the scrum and second centre (8)

I believe the answer is:

blockage

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'obstruction' is the definition.
(I know that obstruction can be written as blockage)

I don't understand the rest of the clue.

(Other definitions for blockage that I've seen before include "Clot" , "Obstruction" , "jam" .)

I've seen this clue in The Irish Times.

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