Crossword Genius

Left one with nothing for tea, which was going too far? (4,3,4)


I believe the answer is:

took the cake

'left one with nothing for tea which was going too far?' is the definition.
The answer and definition can be both related to competing as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?

'left one with nothing for' is the wordplay.
I cannot really see how this works, but
'one' could be 'the' (both can introduce a definite example of something) and 'the' is found in the answer.
'nothing' could be 'o' (O resembles 0) and 'o' is present in the answer.
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in Evening Standard.
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