Crossword Genius

Sort of club for stony members? (5)

Ross

I believe the answer is:

slate

I'm a little stuck... Click here to teach me more about this clue!

'sort of club' is the definition.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for slate that I've seen before include "Scold; hard rock" , "rock used in building" , "Criticise harshly" , "Roofing plate" , "Stone used for roofing" .)

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