Crossword Genius

Riotous mob chasing after graduate from Oxford for a type of grass (6)

Ross

I believe the answer is:

bamboo

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'grass' is the definition.
(I know this)

'riotous mob chasing after graduate from' is the wordplay.
'riotous' is an anagram indicator.
'chasing after' means one lot of letters go next to another.
'graduate' becomes 'BA' (someone with a Bachelor of Arts degree).
'from' becomes 'o' (I've seen this in other clues).
'mob' with letters rearranged gives 'mbo'.
'mbo' after 'ba' is 'bambo'.
'bambo'+'o'='BAMBOO'

'oxford for a type of' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for bamboo that I've seen before include "Woody grass plant" , "Spotted tile; carnival mask" , "Thick tropical cane" , "Tropical grass with strong hollow stems" , "Panda's dinner?" .)

I've seen this clue in The Irish Times.
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