legal beagle
An especially clever, aggressive, or skillful attorney. I might be considered something of a legal beagle now, but I had to work for years to get enough experience to build my reputation.
legal-beagle
and legal-eagle (ˈliglæˈbiglæ and ˈliglæˈiglæ) n. a lawyer. I’ve got a legal-beagle who can get me out of this scrape.