One is not eager 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.

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(Other definitions for apathy that I've seen before include "Absence of interest or emotion" , "Indifference - listlessness" , "Flatness" , "Impassivity - lack of feeling" , "Indifference, emotionlessness" .)

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

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