Glucoside from soapwort takes juice on in (7)

I believe the answer is:

saponin

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

'glucoside from soapwort' is the definition.
'saponin' can be an answer for 'glucoside' (saponin is a kind of glucoside). I am unsure of the 'from soapwort' bit.

'juice on in' is the wordplay.
'juice' becomes 'sap' (juice from a plant).
'sap'+'on'+'in'='SAPONIN'

'takes' acts as a link.

Can you help me to learn more?

(Another definition for saponin that I've seen is " ingredient of detergents".)

I've seen this clue in the Sydney Morning Herald.

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