A segment of DNA (4)

I believe the answer is:

gene

'a segment of dna' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for gene that I've seen before include "Vincent" , "Part of chromosome" , "Hereditary unit on chromosome" , "Bodily factor controlling heredity" , "Hereditary determinant" .)

I've seen this clue in The Guardian.

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