One is not keen to show it (6)

I believe the answer is:

apathy

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

I don't understand the rest of the clue.

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(Other definitions for apathy that I've seen before include "Disinclination to shift" , "Lack of interest or concern" , "Absence of emotion or enthusiasm" , "Impassivity - lack of feeling" , "Flatness" .)

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

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