Possible Clues:

• Too small to be 30 across
• Lyle Lovett would ride one on a boat
• Shetland, for instance
• Small breed of horse
• Lyle Lovett lyric "If I had a ___"
• Small horse - £25
• Little horse
• Doodle's ride
• Sum of �25 (Informal)
• Shetland