Possible Clues:

• ... what's made by hasty judge putting these together side by side
• A pair of braces which are put together by the astute
• They are put together in deduction
• Even count, to a batter
• 'Just for the sound of it (3,3,3)'
• What doctors want to do about women getting 4?
• Put them together for four
• Four, logically
• 4 or 22
• By the sound of it, it's for a quartet