Related Clues:

• Filly, eventually
• Horse; lunar sea
• Horse with a foal
• Morgan's mother
• Ream (anag)
• Horse's mom
• Stallion friend
• Pretty much any 'My Little Pony' character, for example
• Certain dam
• Moon observation
• Fully grown filly
• Mustang's mother
• Old gray beast
• Black Eyed Peas song about a horse?
• Stable tenant?