You'll find this among herbal medicines! (4)
I believe the answer is:
balm
'you'll find' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'among herbal medicines' is the wordplay.
'among' indicates the answer is hidden within the clue.
'BALM' is hidden within 'herbal medicines'.
'this' is the link.
Can you help me to learn more?
(Other definitions for balm that I've seen before include "Soothing medicine for lamb" , "It's comforting" , "Fragrant and healing ointment" , "Something soothing" , "'Ointment, salve (4)'" .)