Separate daughters can be found on island (8)
I believe the answer is:
discrete
'separate' is the definition.
(similar in meaning)
'daughters can be found on island' is the wordplay.
'daughters can' becomes 'dis' (I can't justify this - if you can you should give a lot more credence to this answer).
'be found on' says to put letters next to each other.
'island' becomes 'Crete' (Greek island).
'dis'+'crete'='DISCRETE'
Can you help me to learn more?
(Other definitions for discrete that I've seen before include "Individually separate and distinct" , "Separated" , "Individually distinct, discontinuous" , "Individually distinct in discreet way" , "Individual" .)