Future source of beef, possibly a bit of shank? (4)

I believe the answer is:

calf

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'bit of shank?' is the definition.
('calf' is part of 'shank')

I can't explain the remainder of the clue.

(Other definitions for calf that I've seen before include "Young of domestic cattle" , "stocking filler" , "Young animal; part of body" , "Baby cow" , "Animal that yields veal" .)

I've seen this clue in The Times.

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