Iron panel clearly unrivalled (9)

I believe the answer is:

nonpareil

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

'unrivalled' is the definition.
(I know that unrivalled can be written as nonpareil)

'iron panel clearly' is the wordplay.
'iron panel' can be anagrammed to 'NONPAREIL'.
However, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for nonpareil that I've seen before include "Without equal or rival, from France" , "Super model" , "Peerless" , "like none other" , "without peers" .)

I've seen this clue in the Sydney Morning Herald.

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