Like one's objection to weeds (6)

I believe the answer is:

rooted

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'like' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for rooted that I've seen before include "Fixed to the spot like a plant" , "Deeply felt" , "Firmly established and well planted" , "(Of new cutting) firmly established" , "Firmly established in a plantlike way" .)

I've seen this clue in the Evening Standard.

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