Left after her degree, plant-related (6)

I believe the answer is:

herbal

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'plant-related' is the definition.
I can't judge whether this definition defines the answer.

'left after her degree' is the wordplay.
'left' becomes 'l' (common abbreviation).
'after' says to put letters next to each other.
'degree' becomes 'BA' (Bachelor of Arts).
'her'+'ba'='herba'
'l' after 'herba' is 'HERBAL'.

Can you help me to learn more?

(Other definitions for herbal that I've seen before include "like rocket, for example" , "like Basil?" , "Book of natural remedies" , "Of a plant with medicinal or savoury qualities" , "like vervain" .)

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

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