Crossword Genius

Average, thus doubled (2-2)

Ross

I believe the answer is:

so-so

'average' is the definition.
(I've seen this before)

'thus doubled' is the wordplay.
'thus' becomes 'so' (synonyms).
'doubled' shows that letters should be duplicated.
'so' doubled is 'SO-SO'.

(Other definitions for so-so that I've seen before include "just about adequate" , "'Passable, middling (2-2)'" , "Native of Seville" , "Neither good nor bad" , "Of middling quality" .)

I've seen this clue in The Sun and The Times.
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