It's not this that's so emphatic! (4)

I believe the answer is:

half

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'it's not this that's so emphatic' 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 half that I've seen before include "proportion" , "Short distance - steal!" , "Some football" , "Portion of bread (better than none?)" , "Fifty percent" .)

I've seen this clue in the Evening Standard.

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