Type of crossword unfinished by the French in confusion (6)
I believe the answer is:
jumble
'confusion' is the definition.
(thesaurus)
'type of crossword unfinished by the french' is the wordplay.
'type of crossword' becomes 'jumbo'.
'unfinished' means to remove the last letter.
'by' is a charade indicator (letters next to each other).
'the french' becomes 'le'.
'jumbo' with its last letter removed is 'jumb'.
'jumb'+'le'='JUMBLE'
'in' is the link.
(Other definitions for jumble that I've seen before include "Untidy things; mix up" , "disorder" , "Muddle" , "Discarded assortment (for sale?)" , "Untidy mess" .)