Earlier, minced beef containing a certain amount of pork (6)

I believe the answer is:

before

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'earlier' is the definition.
(synonyms)

I don't understand how the rest of the clue works.

(Other definitions for before that I've seen before include "On a previous occasion" , "In front of (something)" , "In front of or previous to" , "In sight of" , "Earlier in time" .)

I've seen this clue in the Evening Standard.

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