I'd put in stake behind washer! (5)

I believe the answer is:

bidet

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'washer' is the definition.
(thesaurus)

'i'd put in stake behind' is the wordplay.
'put in' means one lot of letters goes inside another.
'stake behind' becomes 'bet' (synonyms. I am not sure about the 'behind' bit.).
'id' placed within 'bet' is 'BIDET'.

Can you help me to learn more?

(Other definitions for bidet that I've seen before include "Bathroom feature" , "Washing facility" , "Bathroom appliance" , "Bathroom basin" , "Bathroom fitment" .)

I've seen this clue in The Telegraph.

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