Catch rays around excellent Welsh island (6)
I believe the answer is:
taiwan
'island' is the definition.
(Taiwan is an example)
'catch rays around excellent welsh' is the wordplay.
'catch rays' becomes 'tan' (get a suntan).
'around' is an insertion indicator.
'excellent' becomes 'ai' (resembles 'A1', old-fashioned term for excellent).
'welsh' becomes 'W' (abbreviation).
'ai'+'w'='aiw'
'tan' going around 'aiw' is 'TAIWAN'.
(Other definitions for taiwan that I've seen before include "Republic of China" , "Large island off China" , "I want a turn on this island" , "Disputed island off china, used to be Formosa" , "Island off mainland China" .)