One of The Greens in Cork - a lefty? (4)
I believe the answer is:
kale
'one of the greens' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'in cork a lefty?' is the wordplay.
'in' says the answer is hidden in the clue.
'KALE' is hidden within 'cork a lefty'.
Can you help me to learn more?
(Other definitions for kale that I've seen before include "Crinkled-leaf cabbage" , "Crinkle-leaf cabbage" , "Cabbage in a lake" , "Hardy cabbage" , "(Curly?) cabbage" .)