You can make tea with it (5)

I believe the answer is:

senna

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the remainder of the clue.

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(Other definitions for senna that I've seen before include "Brazilian F1 champion, d. 1994" , "should make you want to go quickly" , "Champion driver.once" , "It produces pods" , "Cassia tree, laxative" .)

I've seen this clue in the Evening Standard.

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