A piece of finest ripe dragonfruit or watermelon might be described thus (7)
I believe the answer is:
striped
'watermelon might be described thus' is the definition.
I can't judge whether this definition defines the answer.
'a piece of finest ripe dragonfruit' is the wordplay.
'a piece of' says the answer is hidden in the clue.
'STRIPED' can be found hidden inside 'finest ripe dragonfruit'.
'or' is the link.
Can you help me to learn more?
(Other definitions for striped that I've seen before include "Like a zebra" , "Decorated with lines" , "Red tips (anag.)" , "streaked" , "like Shere Khan" .)