Relaxed description of weasels? (7)

I believe the answer is:

easeful

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'relaxed' is the definition.
Both the answer and definition are adjectives.
Perhaps you can see an association between them that I don't see?

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

Can you help me to learn more?

(Other definitions for easeful that I've seen before include "Relaxing" , "Calm" , "Sea fuel (anag)" , "Providing comfort" , "Simple" .)

I've seen this clue in The Irish Times.

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