Caribbean runner? (4)
I believe the answer is:
bean
'caribbean runner?' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'caribbean runner?' is the wordplay.
'BEAN' is hidden within the letters.
But, I'm not sure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for bean that I've seen before include "Vegetable; coffee seed" , "Seed of e.g. coffee" , "Kidney-shaped seed as for coffee" , "Seed of a leguminous plant" , "It's often baked" .)