I'm guilty of a choice about hosting nude show (3,5)
I believe the answer is:
mea culpa
'i'm guilty' is the definition.
(Latin phrase meaning 'by my fault')
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(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" .)