We set out to be charming (5)
I believe the answer is:
sweet
'be charming' is the definition.
(thesaurus)
'we set out' is the wordplay.
'out' is an insertion indicator.
'we' going inside 'set' is 'SWEET'.
'to' is the link.
(Other definitions for sweet that I've seen before include "Sugary - but might be tart!" , "Cute" , "Candy item" , "bon-bon" , "(see 15 across) A Chinese sauce" .)