Crossword Genius

Where mother does experiments standing upside down in oil (6)

Ross

I believe the answer is:

balsam

'oil' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for balsam that I've seen before include "Soothing herb" , "Balm of Gilead" , "flowering plant" , "Resin-yielding tree" , "Aromatic ointment" .)

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