Natural oils, perhaps, bottled in what year? (6)

I believe the answer is:
earthy
'natural' is the definition.
(similar in meaning)
'oils perhaps bottled in what year?' is the wordplay.
'oils perhaps' becomes 'art' (I am not sure about this - if you are sure you should believe this answer much more).
'bottled in' means one lot of letters goes inside another.
'what' becomes 'eh' (sound used to ask 'what?' or 'pardon?').
'year?' becomes 'y'.
'art' going within 'eh' is 'earth'.
'earth'+'y'='EARTHY'
Can you help me to learn more?
(Other definitions for earthy that I've seen before include "Like soil; uninhibitedly direct" , "Gross, unrefined" , "Coarse or gross" , "Of the soil, lusty" , "Vulgar, of the soil" .)
