Islander trained to be a mason? (6)
I believe the answer is:
samoan
'islander' is the definition.
(I've seen this before)
'trained to be a mason?' is the wordplay.
'trained to be' indicates an anagram (to train can mean to grow something into a shape).
'a'+'mason'='amason'
'amason' is an anagram of 'SAMOAN'.
(Other definitions for samoan that I've seen before include "Islander" , "from part of Polynesia" .)