Crossword Genius

Middle-aged ones cram classes (6)

Ross

I believe the answer is:

genera

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'classes' is the definition.
(more than one genus - a class or category)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for genera that I've seen before include "similar groups" , "Biological groups" , "Orders with common characteristics" , "Categories making up a family" , "Taxonomic categories (biology)" .)

I've seen this clue in the Sydney Morning Herald.
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