Essential oil bottled in plastic amphora (7)

I believe the answer is:

camphor

'essential oil' is the definition.

'bottled in plastic amphora' is the wordplay.
'bottled in' says the answer is hidden in the clue.
'CAMPHOR' is hidden within 'plastic amphora'.

(Other definitions for camphor that I've seen before include "Mothball chemical" , "Aromatic substance that repels insects" , "Liniment" , "Constituent of mothballs" , "Medicinal inhalant" .)

I've seen this clue in The Independent and The Sun.

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