Another case isn't about the point of the compass, but other cases in point (9)
I believe the answer is:
instances
'the compass but other cases in point' is the definition.
I can't tell whether this defines the answer.
'another case isn't about the point' is the wordplay.
'another' indicates an anagram.
'about' means one lot of letters goes inside another.
'the point' becomes 'N' (N is an example).
'case'+'isnt'='caseisnt'
'caseisnt' anagrammed gives 'istances'.
'istances' enclosing 'n' is 'INSTANCES'.
'of' is the link.
Can you help me to learn more?
(Other definitions for instances that I've seen before include "Incessant (anag)" , "Examples, illustrations" .)