Crossword Genius

Vain noble vaguely impractical (3-6)

Ross

I believe the answer is:

non-viable

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'impractical' is the definition.
Both the definition and answer are adjectives.
Maybe there's a link between them I don't understand?

'vain noble vaguely' is the wordplay.
'vaguely' is an anagram indicator.
'vain'+'noble'='vainnoble'
'vainnoble' anagrammed gives 'NON-VIABLE'.

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