Ladies trained to become models (6)
I believe the answer is:
ideals
'models' is the definition.
(ideal is a kind of model)
'ladies trained' is the wordplay.
'trained' is an anagram indicator (to train can mean to grow something into a shape).
'ladies' with letters rearranged gives 'IDEALS'.
'to become' acts as a link.
(Other definitions for ideals that I've seen before include "Lofty aspirations for ladies" , "Standards of perfection" , "Morals" , "High values for ladies" , "'Perfect models, highest notions (6)'" .)