Crossword Genius

Mangled closed-circuit capturing leak in outhouse (9)

Ross

I believe the answer is:

scrunched

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'mangled' is the definition.
The definition and answer can be both to do with contact as well as being past participle verbs.
Maybe they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for scrunched that I've seen is " Crushed noisily".)

I've seen this clue in The Independent.
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