Hi.
the phrase is one used in India and the Far East
Could you please tell me why it is used here? What does it do to the sentence?
'One' is in this kind of context a noun that refers to a single person/thing. Often, this is something that has been mentioned previously.
eg I looked at a red car and a blue car. I bought the blue one.
eg I need to buy a car. I want one that is red.
Best wishes, Clive