Result of baking: experts taken aback about smell; kitchen evacuated at first (6,4)
I believe the answer is:
sponge cake
'kitchen evacuated at first' is the definition.
I can't tell whether this definition defines the answer.
'result of baking experts taken aback about smell' is the wordplay.
'result of baking' becomes 'ek' (I can't justify this - if you can you should believe this answer much more).
'experts' becomes 'aces' (ace is a kind of expert).
'taken aback' is a reversal indicator.
'about' indicates putting letters inside.
'smell' becomes 'pong' (pong can informally mean a bad smell).
'ek'+'aces'='ekaces'
'ekaces' reversed gives 'secake'.
'secake' going around 'pong' is 'SPONGE-CAKE'.
Can you help me to learn more?
(Other definitions for sponge cake that I've seen before include "light when baked" , "Victoria for instance" , "Victoria sandwich, say" , "Light item of bakery" , "Dessert" .)