Better bathroom device? (7)

I believe the answer is:

plunger

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'better bathroom' is the first definition.
'plunger' can be an answer for 'better' (I've seen this before). I'm not certain of the 'bathroom' bit.

'device?' is the second definition.
(plunger is a kind of device)

Can you help me to learn more?

(Other definitions for plunger that I've seen before include "diver" , "Drain unblocker" , "Rubber device for clearing blocked pipes" , "Device for clearing blocked drains" , "Rubber pipe unblocker" .)

I've seen this clue in the Sydney Morning Herald.

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