Crossword Genius

I try build a puzzle for permanence (10)

Ross

I believe the answer is:

durability

'for permanence' is the definition.
(durability is a kind of permanence)

'i try build a puzzle' is the wordplay.
'puzzle' indicates anagramming the letters.
'i'+'try'+'build'+'a'='itrybuilda'
'itrybuilda' anagrammed gives 'DURABILITY'.

I've seen this clue in the Sydney Morning Herald.
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