The term 'Harbour Sight' can be broken down into two crossword solutions: TUG (3 letters) and SEAL (4 letters). A TUG is a type of boat that is used to maneuver larger vessels in tight spaces, such as harbours. Seals are aquatic mammals that are often seen in harbours, particularly in colder climates. Therefore, the term 'Harbour Sight' could refer to both the TUG boats and seals that are commonly seen in harbours.