Crossword Genius

Being useless, but being quite unaware of it (6,2,4)

Ross

I believe the answer is:

having no idea

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

'being useless but being quite unaware of it' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'being useless but being quite unaware of it' is the wordplay.
I cannot quite understand how this works, but
'of' could be 'o' and 'o' is found within the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is present in the answer.
'being' could be 'da' (D.A. is an example) and 'da' is located in the leftover letters.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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