Individual daughter is on island (8)
I believe the answer is:
discrete
'individual' is the definition.
'daughter is on island' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'on' says to put letters next to each other.
'island' becomes 'crete' (Greek island).
'd'+'is'+'crete'='DISCRETE'
(Other definitions for discrete that I've seen before include "Separated" , "Individually distinct, maybe discreet" , "independent" , "Secret ID (anag) - separate" , "Individual" .)