1) Away from the starboard side 2) Command to a helmsman 3) Direction, at sea 4) Land as a ship 5) Left 6) Left at sea 7) Left in the Navy 8) Left in the ocean 9) Left of the helm 10) Left off land 11) Left on a boat 12) Left on a liner 13) Left on a river 14) Left on a ship 15) Left on board 16) Left on deck Found on https://www.crosswordclues.com/clue/aport
A·port' adverb [ Prefix a- + port .] (Nautical) On or towards the port or left side; -- said of the helm. Found on http://www.encyclo.co.uk/webster/A/104