There are many possible answers to the crossword clue "a dessert." The shortest ones are 3 letters, such as "pie" or "ice," and common words include "cake," "flan," "tart," "sweet," "eclair," "mousse," "pudding," "gelatin," "trifle," "sorbet," and many others. There are even long answers like "pumpkinpie milkshakes." Here is a list with some common crossword answers for "a dessert":

Length| Dessert Answers
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3| pie, ice
4| cake, flan, tart, menu
5| sweet, bombe
6| eclair, mousse, trifle, afters
7| pudding, gelatin, parfait, sherbet, spumoni, spumone
8+| charlotte, napoleon, pecanpie, mississippimudpie, pumpkinpiemilkshake

This variety shows the wide range of desserts commonly used in crossword puzzles.