Make attractive (6)
'make attractive' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for endear that I've seen before include "Make appeal" , "inspire love" , "Bind in gratitude" , "Cause to like" , "make sweet" .)
(Other definitions for beautify that I've seen before include "Enhance appearance" , "Make prettier" , "Make more pretty" , "Make lovely" .)