That's an Order!' is a phrase used to indicate that something must be done immediately. The crossword solutions for this phrase are DORIC (5 letters), IONIC (5 letters), EDICT (5 letters), FIAT (4 letters), and DOIT (4 letters). Doric is an ancient Greek architectural style, Ionic is another ancient Greek architectural style, EDICT is an authoritative command or order issued by a ruler or government, FIAT is a formal authorization or instruction to do something, and Doit is a slang term meaning 'do it'.