Possible Clues:

• Legendary Ethel of Broadway
• Ethel who sang 'There's No Business Like Show Business'
• Marines probing tight, legless bloke found in sea
• Star of the original Broadway production of 'Annie Get Your Gun'
• Triton, e.g
• Ariel's father Triton, e.g
• Mythical trident-holder
• 'Gypsy' star, 1959
• Fishy figure not generous about room
• Mesmerise commander at centre, displaying fish-like creature