Crossword Genius

How to (hopefully) clear toilet when so youthful? (2,3,5,5)

Ross

I believe the answer is:

in the first flush

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

'so youthful?' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'how to hopefully clear toilet' is the wordplay.
I cannot really see how this works, but
'clear' could be 'inthe' (synonyms) and 'inthe' is found within the answer.
'toilet' could be 'flush' (flush toilet is a kind of toilet) and 'flush' is found in the answer.
The remaining letters 'first' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'when' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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