Chaperon (6)
'chaperon' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for escort that I've seen before include "conduct" , "Lead" , "Provide company - car - guard" , "One who accompanies, for protection or as an honour" , "Accompany, to protect perhaps" .)
(Other definitions for duenna that I've seen before include "Chaperone in Madrid" , "Iberian chaperone" , "Female companion[" , "Chaperon to young girl in Spain" , "Woman chaperon in Hispanic countries" .)