Worry when the ineffectual politicians are returned (4)

I believe the answer is:

stew

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'worry' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for stew that I've seen before include "Cook - hash" , "fish tank" , "what might be for dinner?" , "Cook slowly and for a long time in liquid" , "Dish cooked in a pot" .)

I've seen this clue in the Evening Standard.

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