Cain sent wandering, for example (8)
I believe the answer is:
instance
'example' is the definition.
('instance' can be a synonym of 'example')
'cain sent wandering' is the wordplay.
'wandering' is an anagram indicator.
'cain'+'sent'='cainsent'
'cainsent' anagrammed gives 'INSTANCE'.
'for' is the link.
(Other definitions for instance that I've seen before include "'Example, illustration (8)'" , "An insect (anag.)" , "Example or single occurrence of something" , "Exemplify" , "Canniest (anag) - occurrence" .)