Diffusion within cosmos isolated (7)

I believe the answer is:

osmosis

'diffusion' is the definition.
(I know that osmosis is a type of diffusion)

'within cosmos isolated' is the wordplay.
'within' says the answer is hidden in the clue.
'OSMOSIS' is hidden in the letters of 'cosmos isolated'.

(Other definitions for osmosis that I've seen before include "XWD SETTER" , "Diffusions of liquids" , "Absorption (biol.)" , "Miss Soo? (anag)" , "gradual diffusion" .)

I've seen this clue in The Telegraph.

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