Possible Clues:

• One always making adjustments on the job?
• Creator of suit mishandled trial, securing nothing
• Garment maker alternatively extending part hanging at back of coat
• Le Carré's 'Tinker ___ Soldier Spy'
• Man of the cloth perhaps finishes with 15 across similarly
• User of French chalk
• Worker on London's Savile Row
• Others acquire their habits from him
• Fleet's last crew member gets rid of small cutter
• Is responsible for outfit producing something to go with 3 down and half of 9 across