President detailed Tesla's rear-end washer (5)

I believe the answer is:

bidet

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

'washer' is the definition.
(thesaurus)

'president detailed tesla's' is the wordplay.
'president' becomes 'biden' (Joe Biden).
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'tesla' becomes 'T' (scientific unit).
'biden' with its last letter taken away is 'bide'.
'bide'+'t'='BIDET'

'rear-end' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for bidet that I've seen before include "Bathroom fixture" , "bathroom cleaner" , "bathroom accessory" , "Debit (anag)" , "Bathroom item" .)

I've seen this clue in The Independent.

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