Crossword Genius

Diabolic writing on a medical form (10)

Ross

I believe the answer is:

demoniacal

'diabolic' is the definition.
(thesaurus)

'on a medical form' is the wordplay.
'form' indicates an anagram.
'on'+'a'+'medical'='onamedical'
'onamedical' is an anagram of 'DEMONIACAL'.

'writing' is the link.

(Another definition for demoniacal that I've seen is " Fiendish".)

I've seen this clue in the Sydney Morning Herald.
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