Panic over salt in sweet cake (8)

I believe the answer is:

flapjack

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'cake' is the definition.
(flapjack is a kind of cake)

'panic over salt in sweet' is the wordplay.
'panic' becomes 'flap' (I've seen this before).
'over salt in sweet' becomes 'jack' (I can't justify this - if you can you should give a lot more credence to this answer).
'flap'+'jack'='FLAPJACK'

Can you help me to learn more?

(Other definitions for flapjack that I've seen before include "Flat cake" , "Oaty biscuit; US pancake" , "Oatcake" , "Biscuit made with rolled oats" , "One must chew over that" .)

I've seen this clue in The Telegraph.

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