19 across
Procedure
for
trimming
most
of
keto
meat
(7)
Procedure for trimming most of keto meat (7)
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The definition is at the end of the clue.
How the clue works
The definition is just meat, and brisket is a cut of beef. For the wordplay, take BRIS, the Jewish circumcision ceremony, which is your "procedure for trimming", and attach KET, which is "most of keto" once you've dropped its last letter.