WORLD’S SMALLEST, HARDEST CROSSWORD

ACROSS

1. Tobacco mouthful (4) 4. Learning (abbr) (2) 5. To be in operation (2) 6. Any plant of the Queensland hemp genus (4)

DOWN

1. UK local rate tax (obs) (4) 2. Substantial (abbr) (2) 3. Horse halter (4) 5. (Chem symbol) gadolinium (2)