Crossword Genius

Show what hapless crossword setter admitted (2,5,1,6,1,4)

Ross

I believe the answer is:

im sorry i havent a clue

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

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

'show what hapless crossword setter' is the wordplay.
I cannot really see how this works, but
'show' could be 'vent' (venting is a kind of showing) and 'vent' is found in the answer.
'what' could be 'sorry' (I've seen this before) and 'sorry' is found in the answer.
'setter' could be 'i' (the person who set this crossword) and 'i' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.
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