Prickly pear (7)
'prickly pear' is the definition.
(nopal is a kind of prickly pear)
This is the entire clue.
(Other definitions for nopal that I've seen before include "Prickly type" , "Prickly growth" , "Prickly pear cactus" , "Mexican cactus" .)
'prickly pear' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for opuntia that I've seen before include "Prickly-pear" , "Prickly sort" , "Eg, prickly pear" , "Cactus of the prickly pear genus" , "spiny plant" .)