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This by itself indicates equality (5)

Ross

I believe the answer is:

fifty

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'this by itself indicates equality' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for fifty that I've seen before include "Half-century" , "L" , "A multiple of ten" .)

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