In lab coat, breaking down plant-based substance (9)

I believe the answer is:

botanical

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'down plant-based substance' is the definition.
I can't judge whether this definition defines the answer.

'in lab coat breaking' is the wordplay.
'breaking' indicates anagramming the letters.
'in'+'lab'+'coat'='inlabcoat'
'inlabcoat' with letters rearranged gives 'BOTANICAL'.

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(Other definitions for botanical that I've seen before include "Description of some gardens" , "Relating to the study of plants" , "(Gardens) of scientific interest" .)

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