Crossword Genius

What round Eden could be somewhat rare? (9)

Ross

I believe the answer is:

underdone

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'rare?' is the definition.
('underdone' can be a synonym of 'rare')

'what round eden could be somewhat' is the wordplay.
'round eden' can be anagrammed to 'UNDERDONE'.
However, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for underdone that I've seen before include "Not fully cooked, more time needed" , "could be rare" , "Not sufficiently cooked" , "raw!" , "Inadequately cooked" .)

I've seen this clue in The Times.
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