Crossword Genius

Hoping to benefit from a reduction in the fare (2,1,4)

Ross

I believe the answer is:

on a diet

I'm a little stuck... Click here to teach me more about this clue!

'hoping to benefit' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'from a reduction in the fare' is the wordplay.
I cannot quite understand how this works, but
'from' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
'a' is within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'fare' could be 'e' (E is an example) and 'e' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for on a diet that I've seen is " eating particular foods".)

I've seen this clue in The Globe and Mail and The Irish News.
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