Learned scholar back in front (5)
I believe the answer is:
heard
'learned' is the definition.
('hear' can be a synonym of 'learn')
'scholar back in front' is the wordplay.
'back' suggests the final letters (the letter at the back).
'in' means one lot of letters goes inside another.
'front' becomes 'head'.
The final letter of 'scholar' is 'r'.
'r' inserted inside 'head' is 'HEARD'.
(Other definitions for heard that I've seen before include "Picked up by the ears?" , "Caught - picked up" , "Perceived by the ear" , "Traditional children shouldn't be" , "Attended to" .)