1. [n]  a ludicrous or grotesque act done for fun and amusement
2. [adj]  ludicrously odd; "Hamlet's assumed antic disposition"; "fantastic Halloween costumes"; "a grotesque reflection in the mirror"
3. [v]  act as or like a clown

ANTIC is a 5 letter word that starts with A.

1. \An"tic\, a. [The same word as antique; cf. It. antico
   ancient. See {Antique}.]
   1. Old; antique. (Zo["o]l.) ``Lords of antic fame.'' --Phaer.
   2. Odd; fantastic; fanciful; grotesque; ludicrous.
            The antic postures of a merry-andrew. --Addison.
            The Saxons . . . worshiped many idols, barbarous in
            name, some monstrous, all antic for shape. --Fuller.
   

2. \An"tic\, n.
   1. A buffoon or merry-andrew; one that practices odd
      gesticulations; the Fool of the old play.
   2. An odd imagery, device, or tracery; a fantastic figure.
            Woven with antics and wild imagery.   --Spenser.
   3. A grotesque trick; a piece of buffoonery; a caper.
            And fraught with antics as the Indian bird That
            writhes and chatters in her wiry cage. --Wordsworth.
   4. (Arch.) A grotesque representation. [Obs.]
   5. An antimask. [Obs. or R.]
            Performed by knights and ladies of his court In
            nature of an antic.                   --Ford.
   

3. \An"tic\, v. t. [imp. & p. p. {Anticked}, {Antickt}.]
   To make appear like a buffoon. [Obs.] --Shak.
   

4. \An"tic\, v. i.
   To perform antics.