Big hunk of cake (4)

I believe the answer is:

slab

(Other definitions for slab that I've seen before include "Piece of paving" , "Hunk" , "Flat piece of stone or 20" , "24 tinnies [STRINE] < in a wooden hut [STRINE]" , "Mortuary table" .)

I've seen this clue in the USA Today.

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