Tool secures device emptied behind washer (5)

I believe the answer is:

bidet

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'behind washer' is the definition.
'bidet' can be an answer for 'washer' (thesaurus). I'm not sure about the 'behind' bit.

'tool secures device emptied' is the wordplay.
'tool' becomes 'bit' (bit is a kind of tool).
'secures' indicates putting letters inside.
'emptied' suggests removing the centre.
'device' with its centre removed is 'de'.
'bit' going around 'de' is 'BIDET'.

Can you help me to learn more?

(Other definitions for bidet that I've seen before include "Cleaning vessel for privates" , "Bathroom fitting" , "Where to wash" , "Bathroom appliance" , "Bathroom basin" .)

I've seen this clue in The Sun.

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