Appearing in leotard: Alfred O'Hanlon? (5)

I believe the answer is:

ardal

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

'leotard alfred o'hanlon?' is the wordplay.
'ARDAL' is hidden within the letters.
However, I am uncertain how the hidden word is indicated.

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.

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