A great age for a Scotsman, we hear (3)

I believe the answer is:

eon

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'a great age' is the definition.
'eon' can be an answer for 'age' (eon is a kind of age). I am not sure about the 'a great' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for eon that I've seen before include "Era" , "thousand million years" , "Long period of time" , "Age, epoch" , "plenty of time" .)

I've seen this clue in The Irish Independent.

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