Greek sailors dropping with effect of sun's rays (6)
I believe the answer is:
cretan
'greek' is the definition.
(someone from the Greek island of Crete)
'sailors dropping with effect of sun's rays' is the wordplay.
'sailors' becomes 'crew' (I've seen this before).
'dropping' indicates named letters should be taken away.
'with' becomes 'w' (abbreviation).
'effect of sun's rays' becomes 'tan' (sun tan).
'crew' with 'w' taken out is 'cre'.
'cre'+'tan'='CRETAN'
(Other definitions for cretan that I've seen before include "From Greece" , "Native of Greek island south of mainland (6)" , "One from Greece's largest island" , "Island nationality of citizen of Heraklion" , "Native of a large Greek island" .)