As is 'billet-dou' in 'a billet-doux'? (6,4,1,4)

Guardian Cryptic #29217 | 1 Down | 2023-11-02
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I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

“billet-dou” needs to have an X added, i.e. to be SEALED WITH A KISS, to make a billet-doux, and love letters are often said to be this

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