Crossword Genius

No term for mediocrity of stupidity (6)

Ross

I believe the answer is:

idiocy

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for idiocy that I've seen before include "Extreme foolishness" , "Extreme silliness" , "Great folly" , "Predatory seabird" , "Foolish action or behaviour" .)

I've seen this clue in the Irish Times.
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