Crossword Genius

Is like some grasping forebear? (5,5)

Ross

I believe the answer is:

takes after

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

'is' is the definition.
The definition and answer can be both to do with fundamental existence as well as being verbs in their -s form.
Maybe they are linked in a way I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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