Cross-country runner's incomplete credentials (4)

I believe the answer is:

eden

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'cross-country runner's incomplete credentials' is the definition.
I can't tell whether this definition defines the answer.

'incomplete credentials' is the wordplay.
'incomplete' says the answer is hidden in the clue (an incomplete sample of the clue).
'EDEN' is hidden within 'credentials'.

Can you help me to learn more?

(Other definitions for eden that I've seen before include "Need an odd garden?" , "Place of unspoilt beauty" , "5,27 [PRIME MINISTER]" , "late PM" , "Someone once seen in Number Ten's" .)

I've seen this clue in the Evening Standard.

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