Potter’s creation safe, teacher felt finally (5,6)
I believe the answer is:
peter rabbit
'potter's creation' is the definition.
(character in Beatrix Potter stories)
'safe teacher felt finally' is the wordplay.
'safe' becomes 'peter' (I've seen this before).
'teacher' becomes 'rabbi' (I've seen this before).
'finally' indicates one should take the final letters.
The final letter of 'felt' is 't'.
'peter'+'rabbi'+'t'='PETER RABBIT'
(Other definitions for peter rabbit that I've seen before include "creature" , "Potter personification?" , "Beatrix's hero" , "Beatrix Potter character" .)