They gave advice so wise and so clear perhaps (7)

I believe the answer is:

oracles

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'they gave advice so wise' is the definition.
The definition suggests an adverb but the answer is not.

'so clear perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'so'+'clear'='soclear'
'soclear' anagrammed gives 'ORACLES'.

'and' is the link.

Can you help me to learn more?

(Other definitions for oracles that I've seen before include "They were consulted by ancient Greeks" , "Authoritative statements" , "Prophetic authorities" , "mysterious utterances" , "Authoritative sources" .)

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

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