A first class return from the island (4)
I believe the answer is:
iona
'the island' is the definition.
(I've seen this before)
'a first class return' is the wordplay.
'first' means one lot of letters go next to another.
'class return' becomes 'ion' (I am not sure about this - if you are sure you should believe this answer much more).
'a' after 'ion' is 'IONA'.
'from' acts as a link.
Can you help me to learn more?
(Other definitions for iona that I've seen before include "holy site" , "small island" , "Inner Hebridean island" , "Hebridean island, where in 563 St Columba founded a monastery" , "St Columba monastery isle near Mull" .)