Porridge shock, as had bears (5)

I believe the answer is:

kasha

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'porridge' is the definition.
(I know that kasha is a type of porridge)

'shock as had bears' is the wordplay.
'KASHA' is hidden within the letters.
However, I am uncertain how this is indicated.

Can you help me to learn more?

I've seen this clue in The Independent.

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