Medicinal tea Anne’s brewed (5)

I believe the answer is:

senna

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'medicinal tea' is the definition.
The definition and answer can be both plants as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'anne's brewed' is the wordplay.
'brewed' indicates an anagram.
'annes' is an anagram of 'SENNA'.

Can you help me to learn more?

(Other definitions for senna that I've seen before include "Natural laxative" , "Champion driver.once" , "Formula One driver" , "It produces pods" , "Medicinal plant - racing driver, Ayrton" .)

I've seen this clue in the Evening Standard.

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