Old people, for instance, going astray (8)
I believe the answer is:
ancients
'old people' is the definition.
(people who lived in ancient times)
'instance going astray' is the wordplay.
'going astray' indicates an anagram.
'instance' with letters rearranged gives 'ANCIENTS'.
'for' is the link.
(Another definition for ancients that I've seen is " Pistol and Iago".)
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