Tool secures device unloaded 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 am not certain of the 'behind' bit.

'tool secures device unloaded' is the wordplay.
'tool' becomes 'bit' (bit is a kind of tool).
'secures' indicates putting letters inside.
'unloaded' says to hollow out the word (remove centre letters) (the content of the word is unloaded).
'device' with its centre taken out 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 "bathroom installation" , "Debit (anag)" , "Bathroom fitment" , "Bathroom basin" , "Bathroom fitting" .)

I've seen this clue in The Telegraph.

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