Cretan king's mother's contribution to neuropathology (6)
I believe the answer is:
Here is my best explanation:
'cretan king's mother's' is the definition.
(mother of Minos in Greek myth)
'contribution to neuropathology' is the subsidiary indication.
'contribution to' says the answer is hidden in the clue.
'europa' can be found hidden inside 'neuropathology'.
(Other definitions for europa that I've seen before include "Moon of Jupiter and Greek goddess", "The mother of King Minos of Crete and a moon of Jupiter", "Satellite of Jupiter", "satellite", "A moon of Jupiter and Greek goddess", "Princess who bore Zeus three sons - one of the moons of Jupiter", "old bull-lover?", "Girl carried off by Zeus disguised as a bull", "Minos's mother" and "Loved by Zeus".)