22 across
Thick-headed
Genevan
philosopher’s
collection
of
bride’s
clothing
(9)
Thick-headed Genevan philosopher’s collection of bride’s clothing (9)
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The definition is at the end of the clue.
How the clue works
Look at collection of bride's clothing — that's your definition. For the wordplay, you want the head (first letter) of Thick, which gives you T, and stick that in front of Rousseau, the Genevan philosopher. T plus ROUSSEAU and you're there.