PM's need for reshuffle (4)

I believe the answer is:

eden

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'pm's' is the definition.
(former prime minister Anthony Eden)

'need for reshuffle' is the wordplay.
'need' can be anagrammed to 'EDEN'.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for eden that I've seen before include "PM 1955-56" , "Paradise - ex-prime minister" , "Place of unspoiled beauty" , "Need an odd garden?" , "The - - Project, Cornwall" .)

I've seen this clue in The Telegraph.

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