Wise words they utter could be so clear (7)

I believe the answer is:

oracles

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'wise words they utter' is the definition.
The definition suggests an adverb but the answer is not.

'could be so clear' is the wordplay.
'could be' indicates anagramming the letters.
'so'+'clear'='soclear'
'soclear' with letters rearranged gives 'ORACLES'.

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(Other definitions for oracles that I've seen before include "They would be asked questions" , "Solacer for wise or knowledgeable people" , "Prophets, seers" , "Authoritative sources" , "Authoritative statements" .)

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