Below are possible answers for the crossword clue A.
5 letter answer(s) to a
early testing stage of a software or hardware product; "alpha version"
first in order of importance; "the alpha male in the group of chimpanzees"; "the alpha star in a constellation is the brightest or main star"
the 1st letter of the Greek alphabet
A town in Queensland Australia
the beginning of a series or sequence; "the Alpha and Omega, the first and the last, the beginning and the end"--Revelations
10 letter answer(s) to a
not decided or not known; "were indefinite about their plans"; "plans are indefinite"
vague or not clearly defined or stated; "must you be so indefinite?"; "amorphous blots of color having vague and indefinite edges"; "he would not answer so indefinite a proposal"
3 letter answer(s) to a
eminent beyond or above comparison; "matchless beauty"; "the team's nonpareil center fielder"; "she's one girl in a million"; "the one and only Muhammad Ali"; "a peerless scholar"; "infamy unmatched in the Western world"; "wrote with unmatchable clarity"; "unrivaled mastery of her art"
a single person or thing; "he is the best one"; "this is the one I ordered"
indefinite in time or position; "he will come one day"; "one place or another"
the smallest whole number or a numeral representing this number;
being a single entity made by combining separate components; "three chemicals combining into one solution"
used informally as an intensifier; "that is one fine dog"
of the same kind or quality; "two animals of one species"
used of a single unit or thing; not two or more; "`ane' is Scottish"
having the indivisible character of a unit; "a unitary action"; "spoke with one voice"