Crossword Genius

Founded in botany? (6)

Ross

I believe the answer is:

rooted

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'founded' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for rooted that I've seen before include "Firmly established in a plantlike way" , "Firmly attached as plants are to ground" , "Frivolousness" , "Fixed in place like plants in soil" , "(Of new cutting) firmly established" .)

I've seen this clue in The Mirror.
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