Highball! (3)

I believe the answer is:

lob

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'highball' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

This is all the clue.

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(Other definitions for lob that I've seen before include "High throw or hit" , "Throw ball in high arc" , "Lofted ball" , "Chuck" , "High shot" .)

I've seen this clue in the Evening Standard.

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