This French saint gets upset over collection of filth (7)

I believe the answer is:

cesspit

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'this french saint gets upset over collection of filth' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'this french saint gets upset over collection of filth' is the wordplay.
'this french' becomes 'ce' ('this' in French).
'saint' becomes 's'.
'gets' is a charade indicator (letters next to each other).
'upset over' is a reversal indicator (knocked over).
'collection of filth' becomes 'tips' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'tips' written backwards gives 'spit'.
'ce'+'s'+'spit'='CESSPIT'

Can you help me to learn more?

(Other definitions for cesspit that I've seen before include "Sewage holder" , "Sewage receptacle" , "Sewage storer" , "Foul and squalid place" , "Place for filthy water" .)

I've seen this clue in The Times.

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