Crossword Puzzle High-level melody

Clue: High-level melody

High level? (ATTIC with 5 letters)
High-level conflict (DOGFIGHT with 8 letters)
At a higher level (UPSTAIRS with 8 letters)
"Hip-hop on a higher level" magazine (XXL with 3 letters)
Peruvian city with the highest ultraviolet light level on Earth (CUZCO with 5 letters)
High-level opening? (OZONEHOLE with 9 letters)
High-level employee (EXEC with 4 letters)
High-level argot (GOBBLEDYGOOK with 12 letters)
Boner on a high level (ERRATUM with 7 letters)
High-level storage areas (ATTICS with 6 letters)