Crossword Genius

Vegetable on spike causes injury (11,3)

Ross

I believe the answer is:

cauliflower ear

I'm a little stuck... Click here to teach me more about this clue!

'injury' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'vegetable on spike' is the wordplay.
'vegetable' becomes 'cauliflower' (cauliflower is a kind of vegetable).
'on spike' becomes 'ear' (spike is another term for an ear of grain. I am not sure about the 'on' bit.).
'cauliflower'+'ear'='CAULIFLOWER EAR'

'causes' acts as a link.

Can you help me to learn more?

(Other definitions for cauliflower ear that I've seen before include "Auricular deformation seen in boxers and rugby forwards?" , "damaged appendage" , "result of being battered?" , "Damaged organ" , "Battle-scarred lug" .)

I've seen this clue in The Daily Express.
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