Genealogist's diagram (4)

I think it could be either:

tree

tori

'genealogist's diagram' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tree that I've seen before include "Eg, laburnum" , "A number" , "Ash or elm, for example" , "Care for shoes" , "elder, maybe" .)

I've seen this clue in The Guardian.

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