Plant like manioc flourished around the Pacific rim (7)
I believe the answer is:
campion
'plant' is the definition.
(campion is a kind of plant)
'manioc flourished around the pacific rim' is the wordplay.
'flourished' indicates anagramming the letters (I've seen this in other clues).
'around' indicates putting letters inside.
'the pacific rim' becomes 'p' (I can't justify this - if you can you should give a lot more credence to this answer).
'manioc' with letters rearranged gives 'camion'.
'camion' placed around 'p' is 'CAMPION'.
'like' acts as a link.
Can you help me to learn more?
(Other definitions for campion that I've seen before include "Plant with pink or white flowers" , "Wayside flower" , "Small flower; Thomas -, Elizabethan poet" , "Here's one blooming" , "Wild flower (red, white or bladder)" .)