Attendant might turn over half of the duvets where patients sleep (7)

I believe the answer is:

steward

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'attendant' is the definition.
(I know that steward is a type of attendant)

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

Can you help me to learn more?

(Other definitions for steward that I've seen before include "One who looks after passengers" , "Crowd-control official" , "Ship/aircraft worker" , "Maritime waiter" , "Cabin attendant" .)

I've seen this clue in The Irish Times.

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