Attorney upsets surgeon - risky (9)
I believe the answer is:
dangerous
'risky' is the definition.
(similar in meaning)
'attorney upsets surgeon' is the wordplay.
'attorney' becomes 'DA' (abbreviation for District Attorney).
'upsets' indicates an anagram.
'surgeon' anagrammed gives 'ngerous'.
'da'+'ngerous'='DANGEROUS'
(Other definitions for dangerous that I've seen before include "Insecure" , "Unsafe, risky" , "likely to blow up" , "Hairy" , "Perilous, unsafe" .)