Crossword Genius

One transaction that can't be faulted (5)

Ross

I believe the answer is:

ideal

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'one transaction that can't be faulted' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?

'one transaction' is the wordplay.
'one' becomes 'i' (Roman numeral).
'transaction' becomes 'deal' (a deal is a transaction or exchange).
'i'+'deal'='IDEAL'

Can you help me to learn more?

(Other definitions for ideal that I've seen before include "Just perfect, couldn't be better" , "existing only in imagination" , "Perfect for the purpose" , "Utopian; yardstick" , "Consummate" .)

I've seen this clue in the Evening Standard.
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