Crossword Genius

Surname of the critic who says everything’s awful? (6)

Ross

I believe the answer is:

slater

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'surname of the critic who says everything's awful?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

This is all the clue.

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(Other definitions for slater that I've seen before include "Man on top" , "Does one abuse" , "Layer of roof slabs" , "Professional roof worker" , "High-reaching worker perhaps" .)

I've seen this clue in the Evening Standard.
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