Possible Clues:

• Mother not out of the old sea
• Re this, stay at sea of old
• Primary sail
• Everystreet
• It might cross 1st, 2nd and 3rd
• Old sea with the old girl in it
• With 59-Across, A-B-C-A in the illustration
• Would she have been in the 27 across of old?
• Principal motivation
• Salt water though one might expect tap water from it