Island is a must, transporting artist (7)
I believe the answer is:
sumatra
'island' is the definition.
(I know that Sumatra is a island)
'a must transporting artist' is the wordplay.
I cannot quite understand how this works, but
'a' is found in the answer.
an anagram of 'must' is 'sumt' which is present in the left over letters.
'artist' could be 'ra' (Royal Academician, member of Royal Academy of Arts) and 'ra' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'is' is the link.
Can you help me to learn more?
(Other definitions for sumatra that I've seen before include "Eastern island" , "Large Indonesian island" , "Some land" , "Large island of Indonesia" , "island in Indian ocean" .)