Big portion (4)

I believe the answer is:

slab

(Other definitions for slab that I've seen before include "Thick piece of something" , "Large block of stone or concrete" , "Broad, thick piece of wood, stone" , "24 tinnies [STRINE] < in a wooden hut [STRINE]" , "Hunk" .)

I've seen this clue in the Newsday.

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