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Tube line used in returning from part of Epping? (4)

Ross

I believe the answer is:

pipe

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

'tube' is the definition.
(pipes are tubular)

'line used in returning from part of epping?' is the wordplay.
I cannot quite understand how this works, but
'from' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
The remaining letters 'pip' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for pipe that I've seen before include "Part of an organ; tube" , "Utter shrilly; wine cask" , "'Tube for water or gas, say (4)'" , "Tube to carry water, gas etc" , "Water carrier" .)

I've seen this clue in the Evening Standard.
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