What Syrinx refused to do, but Selene did, in hospital vessel (6)

I believe the answer is:

bedpan

This might be a double definition.

'what syrinx refused to do but selene did' is the first definition.
The definition suggests a singular noun which matches the answer.

'hospital vessel' is the second definition.

'in' is the link.

(Another definition for bedpan that I've seen is " Hospital receptacle".)

I've seen this clue in The Guardian.

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