Crossword Puzzle Beg off

Clue: Beg off

Company that began offering pet health insurance in 2008 (AETNA with 5 letters)
Musical offering (e.g. ARIA with 4 letters)
Offensively obtrusive (BLATANT with 7 letters)
In an offhand manner (CASUALLY with 8 letters)
Good host's offering (WARMWELCOME with 11 letters)
Lacoste offering (e.g. POLO with 4 letters)
Ice cream shop offering (BANANASPLIT with 11 letters)
Vine offshoot (TENDRIL with 7 letters)
Beginning of the Julian Calendar (ONEAD with 5 letters)
William Carlos Williams poem that begins "so much depends" (THEREDWHEELBB with 13 letters)