PIECEWORD

With the help of the Across clues only, can you fit the 16 pieces into their correct position in the empty grid (which, when completed, wll exhibit a symmetrical pattern)? 1 Change the image of (a product) 2 Prolonged dull pain 3 Thrash 4 Irritate, vex 5 Flag-hoisting rope 6 Repudiate 7 Pertaining to native groups 8 Genial 9 Noisy sleeper 10 Oat breakfast cereal 11 Hindu teacher 12 Most constricted