International Space Station captures terra firma and terrestrial forms like Midway, Hawaii and Japan (7)
I believe the answer is:
'terrestrial forms like midway hawaii and japan' is the definition.
I can't judge whether this defines the answer.
'international space station captures terra firma' is the wordplay.
'international space station' becomes 'iss'.
'captures' means one lot of letters goes inside another.
'terra firma' becomes 'land' (synonyms).
'iss' enclosing 'land' is 'ISLANDS'.
'and' is the link.
Can you help me to learn more?
(Other definitions for islands that I've seen before include "Dalkey and Ireland's Eye, say" , "Falkland" , "Detached areas" , "Ibiza, Corfu etc" , "Eg, Faroes" .)