Crossword Genius

Better - yet so inferior! (7)

Ross

I believe the answer is:

sounder

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'better' is the definition.
Although both the answer and definition are adjectives, they are not in the same form of the adjective.

'so inferior' is the wordplay.
'inferior' becomes 'under' (I've seen this in another clue).
'so'+'under'='SOUNDER'

'yet' is the link.

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I've seen this clue in the Evening Standard.
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