Can Oasis guess about wiseness? (13)
I believe the answer is:
sagaciousness
'wiseness?' is the definition.
(sagaciousness is a kind of wiseness)
'can oasis guess about' is the wordplay.
'about' indicates an anagram.
'can'+'oasis'+'guess'='canoasisguess'
'canoasisguess' anagrammed gives 'SAGACIOUSNESS'.
I've seen this clue in The Telegraph.
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