Perhaps unknown point in Memphis location (5)
I believe the answer is:
egypt
'memphis location' is the definition.
'Egypt' can be an answer for 'location' (Egypt is an example). I am not sure about the 'memphis' bit.
'perhaps unknown point' is the wordplay.
'perhaps' becomes 'eg' (for example).
'unknown' becomes 'y' (algebra).
'point' becomes 'pt' (abbreviation for point).
'eg'+'y'+'pt'='EGYPT'
'in' is the link.
Can you help me to learn more?
(Other definitions for egypt that I've seen before include "Part of Africa" , "Arab republic" , "Cleopatra's country" , "NE African country" , "N. African country" .)