Swan Island's latest script (10)
I believe the answer is:
penmanship
'script' is the definition.
(I know that penmanship is a type of script)
'swan island's latest' is the wordplay.
'swan' becomes 'pen' (pen is a kind of swan).
'island's' becomes 'Man's' (the Isle of Man is an example).
'latest' becomes 'hip' (I can't explain this - if you can you should give a lot more credence to this answer).
'pen'+'mans'+'hip'='PENMANSHIP'
Can you help me to learn more?
(Other definitions for penmanship that I've seen before include "hand" , "Writing skill" , "Skill in handwriting" , "Calligraphy" .)