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Pipe is back on after measure of acid (6)

Ross

I believe the answer is:

siphon

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

'pipe' is the definition.
(thesaurus)

'back on after measure of acid' is the wordplay.
I cannot quite see how this works, but
'on' is present in the answer.
'measure' could be 'ph' (pH is a kind of measure) and 'ph' is present in the answer.
The remaining letters 'si' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'is' acts as a link.

Can you help me to learn more?

(Other definitions for siphon that I've seen before include "Bottle from which a liquid is forced by pressure of gas" , "Drawing device" , "Soda dispenser" , "Kind of bottle for squirting, say soda" , "Tube used to draw a liquid" .)

I've seen this clue in The Times.
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