Ladies may have high ones (6)
I believe the answer is:
ideals
'high ones' is the definition.
Although both the answer and definition are plural nouns, I don't see how they can define each other.
'ladies may' is the wordplay.
'ladies' can be anagrammed to 'IDEALS'.
But, I'm not clear how the anagram is indicated.
'have' is the link.
Can you help me to learn more?
(Other definitions for ideals that I've seen before include "Models, exemplars" , "Noble aspirations for ladies" , "They're perfect" , "Bad ladies have high principles" , "Ethics" .)