Crossword Genius

Eg best for worst, verbally (7)

Ross

I believe the answer is:

synonym

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for synonym that I've seen before include "Word with meaning similar to that of another" , "Word that can be exchanged for another" , "A word that is interchangeable with another" , "My sonny (anag)" , "Alternative word" .)

I've seen this clue in The Guardian.
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