Passable, middling (4)

I think it could be either:

Which length description are you looking for?:

2-2

so-so

I believe this is a double definition.

'passable' is the first definition.
(thesaurus)

'middling' is the second definition.
(thesaurus)

(Other definitions for so-so that I've seen before include "Of middling quality" , "Of average quality" , "OK, but nothing special" , "Indifferently good" , "Mediocre" .)

I've seen this clue in The Mirror.

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