Crossword Genius

The one place that's perfect (5)

Ross

I believe the answer is:

ideal

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'perfect' is the definition.
(similar in meaning)

'the one place' is the wordplay.
'the one' becomes 'i' (Roman numeral).
'place' becomes 'deal' (I can't justify this - if you can you should give a lot more credence to this answer).
'i'+'deal'='IDEAL'

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for ideal that I've seen before include "Optimum" , "Benchmark" , "Something that one hopes to attain" , "Perfectly suited" , "Cutting/stabbing weapons" .)

I've seen this clue in the Evening Standard.
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