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Thereafter, remove father from genealogical chart (4)

Ross

I believe the answer is:

tree

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'thereafter remove' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'father from genealogical chart' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

Can you help me to learn more?

(Other definitions for tree that I've seen before include "Sequoia, for example" , "Large shrub; family line" , "Plane or pine, for example?" , "Oak, for example" , "Plane, e.g." .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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