Save shellfish when temperature is lowered (6)

I believe the answer is:

scrimp

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'save' is the definition.
(scrimping is a kind of saving)

I can't explain the remainder of the clue.

(Other definitions for scrimp that I've seen before include "Be niggardly" , "Treat stingily" , "Skimp, stint" , "To pinch pennies" , "Do or spend less than is needed" .)

I've seen this clue in The Independent.

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