The Oldie 388

[TioMateo]

1) Topping characteristic American dish with curry (5) R?I??
2) This may be left or right of centre, say (6) ?S???E

3) Train for film once in America? (4,5) I?O? H?R?E It looks as if it has to be IRON HORSE. I get the train definition, but don't understand the rest of the clue.

[Mamyalynne]

1 Raita - (T)rait + A(American)

[Mamyalynne]

//Iron Horse was used admiringly when comparing early road and railroad traction engines performance to slower, less powerful horse powered tramways. The Iron Horse term became widely popularized and found frequent use in the century and a half following the competition won by Stephenson's Rocket, in innumerable newspaper articles as well as in various novels. The term's place as a cultural icon is shown by the sheer number of things named after it, and its use in films, other media, and as a term of endearment.//

[Mamyalynne]

2 Tempted to say - Estate - this may be left.

But then it tapers off wordplay wise.