Run pipe down well (4)

I believe the answer is:

gosh

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'run pipe down well' is the definition.
I can't tell whether this definition defines the answer.

'run pipe down' is the wordplay.
'run' becomes 'go' (both can mean to function or work).
'pipe down' becomes 'sh' (both can mean 'be quiet').
'go'+'sh'='GOSH'

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(Other definitions for gosh that I've seen before include "Cor!" , "My goodness!" , "I'm amazed!" , "Exclamation of surprise" , "English infirmary" .)

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