### Clue: A right dust-up over source of Carib foodstuff (9)
### Answer: ARROWROOT 
 ### Explanation: Definition: Carib foodstuff
 A + R(abbrev. for "right") + ROW(a quarrel;a dust-up) **placed above**(over, in a down clue) ROOT(the source, as in "…root of all evil".
Answer: Edible starch sourced from the Caribbean plant of the same name. Thus, "source of" may or may not be part of the defn.