Some knighted, English PM (4)

I believe the answer is:

eden

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

'some knighted english' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'EDEN' can be found hidden inside 'knighted english'.

(Other definitions for eden that I've seen before include "River - garden" , "Unspoiled paradise" , "Biblical garden" , "Old Testament garden" , "PM 1955-56" .)

I've seen this clue in The Telegraph.

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