Genus of cacti that includes the prickly pear (7)

I believe the answer is:

opuntia

(Other definitions for opuntia that I've seen before include "Cactus of the prickly pear genus" , "Eg, prickly pear" , "Genus of cacti" , "prickly plant" , "Prickly-pear" .)

I've seen this clue in The Mirror and The Independent.

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