WORLD’S SMALLEST, HARDEST CROSSWORD

ACROSS

1. Link (4) 5. An expert person (3) 6. Archaeologist’s activity (3) 7. Fraudulent racket (sl) (4)

DOWN

2. Exaltedly poetic (4) 3. Divine snake of Hindu myth (4) 4. (Chem) symbol dubnium (2) 6. Plain-clothes police officer (abbr) (2)