Instructive (11)
'instructive' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for educational that I've seen before include "as an aid to learning" , "Relating to teaching" , "A docile aunt (anag) - instructive" , "Academic" , "Providing knowledge" .)
'instructive' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for didactic that I've seen before include "giving instruction" , "like a school-teacher?" , "Teaching morally" , "(Patronisingly) educational" , "(Tale) with a message" .)