Crossword Puzzle Spender of markkas, once

Clue: Spender of markkas, once

Big spender's offer (MYTREAT with 7 letters)
Credit card offerer (VISA with 4 letters)
Office mail receiver (INBOX with 5 letters)
Speak to the customs officer? (DECLARE with 7 letters)
It officially ended 12/5/33 (PROHIBITION with 11 letters)
Offensive stat (RBI with 3 letters)
Twinings' offerings (TEAS with 4 letters)
First pope to have visited Constantinople while in office (JOHNI with 5 letters)
Yellow ____ (Quebec's official tree) (BIRCH with 5 letters)
Offstage (INTHEWINGS with 10 letters)