Possible Clues:

• Sh! The god is in it for 19 across
• With 42-Across, hanging growth in Louisiana swamps
• Ships about an Armada
• Toasts from shop assistant found on all sides today
• It's useful for communicating with ships travelling around a point
• Don Quixote's tongue
• Scrabble sets for this language have a double L tile
• What the answer at 26-Across is written in
• From Valencia or Malaga?
• What's spoken in Barcelona