Crossword Genius

Level of marsh quite unexceptional (3,8)

Ross

I believe the answer is:

bog standard

'quite unexceptional' is the definition.
(informal phrase meaning ordinary)

I don't understand the remainder of the clue.

(Other definitions for bog standard that I've seen before include "Simple" , "Basic - ordinary (slang)" .)

I've seen this clue in The Times.
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