Fluid-filled sac (4)

I think it could be either:

Which length description are you looking for?:

cyst

'fluid-filled sac' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for cyst that I've seen before include "Benign growth" , "Bag-like growth containing diseased matter" , "Abnormal body cavity" , "Bladder" , "Membrane" .)

I've seen this clue in The Times, The Independent and The Telegraph.

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