Even tallow, for example, is contaminated with some lard (4)

I believe the answer is:

flat

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'even' is the definition.
(similar in meaning)

I can't explain the rest of the clue.

(Other definitions for flat that I've seen before include "Apartment - below the note" , "Not hilly" , "rooms exactly" , "Personal residence" , "No longer charged" .)

I've seen this clue in The Hindu.

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