Crossword Genius

Flood in a toilet rising over belly of cowboy (9)

Ross

I believe the answer is:

avalanche

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

'flood' is the definition.
(I've seen this before)

'a toilet rising over belly of cowboy' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

'in' is the link.

Can you help me to learn more?

(Other definitions for avalanche that I've seen before include "Great snowfall" , "Big slide of snow or stone" , "Landslide of snow" , "Snow slip" , "Deluge" .)

I've seen this clue in The Independent.
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