Etonian who led Britain in terrible denial (4)

I believe the answer is:

eden

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'etonian who led britain' is the definition.
The definition suggests a singular noun which matches the answer.

'in terrible denial' is the wordplay.
'in' says the answer is hidden in the clue.
'EDEN' can be found hidden inside 'terrible denial'.

Can you help me to learn more?

(Other definitions for eden that I've seen before include "Paradise - ex-prime minister" , "The primal garden" , "The best of all gardens" , "A Conservative PM" , "Former prime minister" .)

I've seen this clue in The Guardian.

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