Crossword Genius

Legality, unless flaw developed (10)

Ross

I believe the answer is:

lawfulness

'legality' is the definition.
(lawfulness is a kind of legality)

'unless flaw developed' is the wordplay.
'developed' is an anagram indicator.
'unless'+'flaw'='unlessflaw'
'unlessflaw' is an anagram of 'LAWFULNESS'.

(Another definition for lawfulness that I've seen is " legal condition".)

I've seen this clue in The Daily Express.
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