Crossword Genius

I, for one

Ross

I think it could be either:

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7,6

7*

capital letter

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'i for one' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'i for one' is the wordplay.
I cannot quite understand how this works, but
'i' could be 'a' and 'a' is located in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for capital letter that I've seen before include "I, for example" , "Beginning of sentence" , "I may be" , "Sentences start with one" .)

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