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I put on a perfectly good disguise (7)

Ross

I believe the answer is:

utopian

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'perfectly good disguise' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'i put on a' is the wordplay.
'i put on a' can be anagrammed to 'UTOPIAN'.
However, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for utopian that I've seen before include "Unworkable" , "Just perfect, as in Thomas More's ideal country" , "Aspiring to impracticable perfection" , "Just perfect as in Thomas More's fictional country" , "Fantastic" .)

I've seen this clue in The Globe and Mail.
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