The twins in a spot of bother (4)

I believe the answer is:

both

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'the twins in' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for both that I've seen before include "The two (things)" , "couple" , "The one and the other" , "Each of two (alternatives)" , "Two considered together" .)

I've seen this clue in the Evening Standard.

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