CRYPTIC CROSSWORD

ACROSS 1 Need cup, in addition (9) 6 Hardy sort crossing seas to Iceland (5) 9 Using no animal products, for example, in truck (5) 10 Happening inside, observed prime number (9) 11 Attacked 51-colour problem’s third part (3,4) 12 Milk producer’s company, by rough count (7) 13 Lingers around ancient relics (4-5) 15 Check about second varnish ingredient (5) 17 Count one among ten in the decimal system (5) 18 Reproduce convoluted series of steps (9) 20 One camper interrupting Grandma’s state of bliss (7) 22 Answer after cutting cloths with plaid patterns (7) 25 Cue about a number left after division (9) 26 Principal eastern neighbour of Quebec (5) 27 Posed wearing silky fabric (5) 28 Double knot with loops reversed in it (3-6) DOWN 1 Oddly valid number? (5) 2 Numeral attached to boxer’s medicine (9) 3 Rule Canada’s capital, shortly (5) 4 Travelling tenor is coming up (2,5) 5 Beginners’ saintly attribute? (7) 6 Easy job, obtaining voltage line on an oscilloscope (4,5) 7 Swimming once around a large body of water (5) 8 Changed accents on name of a lake in Germany (9) 13 Article outlaw added to protagonist’s hot peppers (9) 14 Period placed in alternative math process (9) 16 Informing new organization of equal sign (9) 18 Pass school’s final examination, and cheer (7) 19 Oration excited province (7) 21 Send countdown clock back (5) 23 Dance selection from humdrum band (5) 24 Cut very thin, by the sound of it (5)