Crossword Genius

An upright transaction is just what's wanted (5)

Ross

I believe the answer is:

ideal

I'm a little stuck... Click here to teach me more about this clue!

'just what's wanted' is the definition.
I can't judge whether this defines the answer.

'an upright transaction' is the wordplay.
'an' becomes 'i' (Roman numeral for one).
'upright transaction' becomes 'deal' (a deal is a transaction or exchange. I am not sure about the 'upright' bit.).
'i'+'deal'='IDEAL'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for ideal that I've seen before include "To which one aspires" , "Perfect but not likely to become a reality" , "Model of perfection" , "Optimum" , "Conceptual" .)

I've seen this clue in the Evening Standard.
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