One tries to score in it (5)

I believe the answer is:

rugby

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

I cannot understand how the remainder of the clue works.

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(Other definitions for rugby that I've seen before include "Tom Brown's school" , "Game; town" , "Midlands town" , "English city; game" , "Type of football; school" .)

I've seen this clue in The Globe and Mail.

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