Crossword Genius

I gag on a cored root vegetable (9)

Ross

I believe the answer is:

artichoke

'vegetable' is the definition.
(artichoke is a kind of vegetable)

'i gag on a cored root' is the wordplay.
'gag' becomes 'choke' (synonyms).
'on' says to put letters next to each other.
'a cored root' becomes 'art' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'i'+'choke'='ichoke'
'ichoke' put after 'art' is 'ARTICHOKE'.

(Other definitions for artichoke that I've seen before include "See 26" , "Plant with large edible flower-head" , "Jerusalem, perhaps" , "Globe, perhaps" , "Plant with edible flower heads" .)

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