Average, medium (8)

I believe the answer is:

middling

I believe this clue is a double definition.

'average' is the first definition.
(synonyms)

'medium' is the second definition.
(thesaurus)

(Other definitions for middling that I've seen before include "Moderate, average" , "So-so" , "Average, mediocre" , "Medium, average, fair" .)

I've seen this clue in The Irish Times.

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