There's need for variety in a garden (4)

I believe the answer is:

eden

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

'garden' is the definition.
(I've seen this in other clues)

'there's need for variety in a' is the wordplay.
'need' can be anagrammed to 'EDEN'.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for eden that I've seen before include "late PM" , "The perfect garden in need" , "Idyllic garden" , "Unspoiled paradise" , "Our leader once" .)

I've seen this clue in The Globe and Mail.

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