Island at the point of no return (6)
I believe the answer is:
midway
'point of no return' is the definition.
'midway' can be an answer for 'point' (I have seen 'Central point' mean 'midway' so perhaps 'point' could also mean 'midway'). I am unsure of the 'of no return' bit.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for midway that I've seen before include "With as far to go as already travelled" , "Equally distant from the extremes" , "1942 naval battle in the Pacific - towards the centre" , "At the fifty per cent point" , "Towards the middle" .)