Claire's back-to-front cake (6)
I believe the answer is:
eclair
'cake' is the definition.
(eclair is a type of cake)
'claire's back-to-front' is the wordplay.
'claire' can be anagrammed to 'ECLAIR'.
However, I am not sure how this is indicated.
Can you help me to learn more?
(Other definitions for eclair that I've seen before include "Finger-shaped cream-filled cake of choux pastry" , "Long (but not long-lasting) cake" , "Chocolate-topped, cream-filled cake" , "Cake, "long in shape but short in duration"" , "I clear off with thin chocolate cake" .)