Canniest suspect, for example (8)
I believe the answer is:
instance
'example' is the definition.
('instance' can be a synonym of 'example')
'canniest suspect' is the wordplay.
'suspect' indicates an anagram.
'canniest' with letters rearranged gives 'INSTANCE'.
'for' is the link.
(Other definitions for instance that I've seen before include "'Example, illustration (8)'" , "Exemplify" , "Specimen" , "Canniest (anag) - occurrence" , "Occasion" .)