Shrub one encountered right over in region of China (9)
I believe the answer is:
artemisia
'shrub' is the definition.
(artemisia is a kind of shrub)
'one encountered right over in region of china' is the wordplay.
I cannot quite see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
'right' could be 'ar' (I've seen this in other clues) and 'ar' is found within the answer.
'region' could be 'e' (E region is an example) and 'e' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for artemisia that I've seen before include "Bitter tasting plant" , "herbaceous plant" , "Flower" , "species of plant" , "genus of plants" .)