Possible Clues:

• Pr?cis, abstract
• Run-down son with �25 handed over by relative
• The full story is never told when pony is squeezed into the ship
• Raising the little horse's sister, that's not the whole story
• Book report, e.g.
• It makes a long story short
• Small sibling holding up small horse, in summary
• What sounds like evil piece of work, girl, from the outline
• Is £25 raised in two seconds for summary?
• Summary or outline of a book