Crossword Puzzle Formal request?

Clue: Formal request?

Formal request (PETITION with 8 letters)
Request formally (INVITE with 6 letters)
The formal request (RSVP with 4 letters)
Part of a formal request (e.g. DOUBLECURVESIGN with 15 letters)
Formally request (SOLICIT with 7 letters)
Halloween request from a UN infectious disease control agency? (WHOWANTSCANDY with 13 letters)
Egotistical author's request to a reader? (BMARKMYWORDS with 12 letters)
Defense attorney's request (BAIL with 4 letters)
Chow down, more formally (DINE with 4 letters)
Formal flaps (LAPELS with 6 letters)