Frantic legal eagle judge dismissed, one doing filing? (10)
I believe the answer is:
manicurist
'one doing filing?' is the definition.
(a manicurist might file someone's fingernails)
'frantic legal eagle judge dismissed' is the wordplay.
'frantic' becomes 'manic' (both can mean frenzied).
'legal eagle' becomes 'jurist' (a jurist is an expert in the law).
'judge' becomes 'J' (abbreviation for judge).
'dismissed' indicates named letters should be taken away.
'jurist' with 'j' removed is 'urist'.
'manic'+'urist'='MANICURIST'
(Another definition for manicurist that I've seen is " pro with file?".)