Twice returned Very Large for Average (2-2)

I believe the answer is:

so-so

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But I can't explain it at all! Could you help me understand?

(Other definitions for so-so that I've seen before include "OK, but nothing special" , "Only moderately good in repetitive way" , "just about adequate" , "Barely passable" , "Of average quality" .)

I've seen this clue in the Sydney Morning Herald.

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