Crossing island, stop car unexpectedly for fruit (8)
I believe the answer is:
apricots
'fruit' is the definition.
(I've seen this before)
'crossing island stop car unexpectedly' is the wordplay.
'crossing' means one lot of letters goes inside another (to cross can mean to go over or around).
'island' becomes 'i' (geographical abbreviation).
'unexpectedly' indicates anagramming the letters.
'stop'+'car'='stopcar'
'stopcar' is an anagram of 'aprcots'.
'i' put within 'aprcots' is 'APRICOTS'.
'for' is the link.
(Other definitions for apricots that I've seen before include "trees" , "Rio pacts about the fruits" , "Capri sot makes the fruit" , "Rio pacts produce the fruit" , "Car is top (anag.)" .)