Crossword Genius

Know all the old Irish people, for instance, around Limerick (6)

Ross

I believe the answer is:

oracle

I'm a little stuck... Click here to teach me more about this clue!

'limerick' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?

'know all the old irish people for instance around' is the wordplay.
I cannot quite understand how this works, but
'old' could be 'o' (common abbreviation eg in OE for Old English) and 'o' is located in the answer.
'around' could be 'c' (abbreviation for 'circa') and 'c' is present in the answer.
The remaining letters 'rale' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for oracle that I've seen before include "Soothsayer" , "Source of prophecies" , "Source of divine prophecy" , "Diviner of the future" , "Medium of divine revelation" .)

I've seen this clue in The Irish Times.
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