Old scrawl's deciphered with unparalleled skill (5-5)
I believe the answer is:
Here is my best explanation:
'unparalleled skill' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'old scrawl's deciphered' is the wordplay.
'deciphered' is an anagram indicator (I've seen this in other clues).
'oldscrawls' with letters rearranged gives 'WORLD-CLASS'.
'with' acts as a link.