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Calmly suggest removing contents to get sac (4)

Ross

I believe the answer is:

cyst

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'sac' is the definition.
(I know that cyst is a type of sac)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for cyst that I've seen before include "Fluid-filled sac (med.)" , "Small growth" , "Abnormal body sac containing fluid" , "Benign growth" , "Bladder" .)

I've seen this clue in The Telegraph.
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