Possible Clues:

• Gelding can be niggled by this animal, following another horse
• A horse getting hit -- there's bound to be one near here!
• 28-Down, to Tokyo
• Dormitory, to dirty room
• Opts for post, say, in an Indian city, beginning in March
• Starting point for train-spotting, perhaps?
• Eg 'oscillation' of 'colonialist'
• Word formed from letters of another
• Loves to solve, e.g
• Letter shuffle