Base of a healing ointment (6)

I believe the answer is:

balsam

(Other definitions for balsam that I've seen before include "Aromatic resin" , "(Aromatic medicine from) shrub" , "Fragrant medicinal gum from trees" , "Resin-yielding tree" , "Soothing herb" .)

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

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