Crossword Genius

How resoundingly one can beat the opposition (6)

Ross

I believe the answer is:

hollow

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'how resoundingly one can beat' is the first definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'the opposition' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

Can you help me to learn more?

(Other definitions for hollow that I've seen before include "Not solid or genuine" , "Concave - sunken" , "Having an empty space inside" , "Dent; echoey" , "Empty - hole" .)

I've seen this clue in the Evening Standard.
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