Crossword Genius

Elder, for example, in family diagram (4)

Ross

I believe the answer is:

tree

I believe this is a double definition.

'elder for example' is the first definition.
(elder is a kind of tree)

'family diagram' is the second definition.
(I've seen this in another clue)

'in' acts as a link.

(Other definitions for tree that I've seen before include "Christmas decoration" , "Shoe stretcher" , "Birch, say" , "Diagram representing different relationships" , "Branching diagram" .)

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