Crossword Genius

One transaction that's flawless (5)

Ross

I believe the answer is:

ideal

'flawless' is the definition.
(I've seen this in another clue)

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

'that's' is the link.

(Other definitions for ideal that I've seen before include "Standard of perfection or excellence" , "highly desirable" , "Optimal" , "(the best one can get)" , "Model of ethical behaviour" .)

I've seen this clue in The Globe and Mail.
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