Here are the possible solutions for describing an ancient law clue
Answer
Clue
Relevancy
fab
Clue
Word before Four, when describing the Beatles, or Five, when describing Van Halen, or Fifteen, when describing a band I just made up with 15 awesome harpists
Definition
excellent
salic
Clue
Describing an ancient law
saloon
Clue
Describing a bar — describing a car
halal
Clue
Describing meat butchered according to Islamic law
Definition
(Arabic) to slaughter according to Muslim law, also HALLAL