Giant welcoming island painter (6)
I believe the answer is:
titian
'painter' is the definition.
(Titian is an example)
'giant welcoming island' is the wordplay.
'giant' becomes 'titan' (synonyms).
'welcoming' means one lot of letters goes inside another (in sense of 'inviting in').
'island' becomes 'i'.
'titan' going around 'i' is 'TITIAN'.
(Other definitions for titian that I've seen before include "Italian Old Master and hair-colour" , "Colour named after artist" , "Sixteenth century Venetian painter" , "The painter Tiziano Vecellio" , "Italian painter; hair colour" .)