Crossword Genius

Once more, assessing passage about old king (9)

Ross

I believe the answer is:

regrading

'once more assessing' is the definition.
('grading' is a kind of 'assessing' so perhaps 'regrading' is OK for 'once more assessing')

'passage about old king' is the wordplay.
'passage' becomes 'reading' (I've seen this before).
'about' indicates putting letters inside.
'old king' becomes 'GR' (Georgius Rex, Latin for King George).
'reading' placed around 'gr' is 'REGRADING'.

I've seen this clue in The Daily Express.
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