Iron panel forged to unequalled standard (9)

I believe the answer is:

nonpareil

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

'unequalled standard' is the definition.
'nonpareil' can be an answer for 'standard' (thesaurus). I'm not sure about the 'unequalled' bit.

'iron panel forged' is the wordplay.
'forged' is an anagram indicator.
'iron'+'panel'='ironpanel'
'ironpanel' anagrammed gives 'NONPAREIL'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for nonpareil that I've seen before include "Without equal, unrivalled" , "Unique type" , "Eminent beyond comparison" , "Matchless - enrol pain (anag)" , "ideal" .)

I've seen this clue in The Guardian.

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