Crossword Genius

Silly upper-class name? Ernie, perhaps (6)

Ross

I believe the answer is:

unwise

'silly' is the definition.
(thesaurus)

'upper-class name? ernie perhaps' is the wordplay.
'upper-class' becomes 'u' (similar in meaning).
'name?' becomes 'n' (common abbreviation e.g. on forms).
'ernie perhaps' becomes 'Wise' (comedian Ernie Wise).
'u'+'n'+'wise'='UNWISE'

(Other definitions for unwise that I've seen before include "Ill-judged" , "isn't sensible" , "Not sensible, foolish" , "Rash" , "Not sensible or prudent" .)

I've seen this clue in The Telegraph.
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