Crossword Genius

Common foundation (4)

Ross

I believe the answer is:

slab

(Other definitions for slab that I've seen before include "Flat mass of stone" , "Piece, e.g. of cake" , "Paving stone" , "24 tinnies [STRINE] < in a wooden hut [STRINE]" , "Broad, thick piece of wood, stone" .)

I've seen this clue in the LA Times.
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