Anne's brew of tea (5)
I believe the answer is:
senna
'tea' is the definition.
The definition and answer can be both plants as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'anne's brew' is the wordplay.
'brew' is an anagram indicator.
'annes' is an anagram of 'SENNA'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for senna that I've seen before include "Plant with medicinal pods" , "Medicinal plant - racing driver, Ayrton" , "He drove fast" , "Formula One driver" , "Brazilian F1 champion, d. 1994" .)