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I'm guilty of a choice about hosting nude show (3,5)

Ross

I believe the answer is:

mea culpa

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'i'm guilty' is the definition.
(Latin phrase meaning 'by my fault')

I cannot understand how the remainder of the clue works.

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(Other definitions for mea culpa that I've seen before include "'I am to blame (3,5)'" , "Admission of error (Latin)" , "Total admission of one's guilt (Latin)" , "Acknowledgement of one's guilt (Latin)" , "It's all my fault, said the old Romans" .)

I've seen this clue in The Independent.
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