This article identifies and tests a novel diagnostic for clause structure in West Circassian, a polysynthetic language with ergative alignment. The diagnostic concerns an unusual construction involving multiple wh-agreement in relative clauses. I argue that wh-agreement morphology uniformly tracks agreement with a wh-trace, and sentences with more than one instance of wh-agreement are surface manifestations of a parasitic gap dependency. Once multiple wh-agreement is understood in this theoretically familiar light, it can be used as a powerful tool for diagnosing asymmetries between various constituents in the West Circassian clause. By appealing to well-known constraints on parasitic gap licensing, the article demonstrates that the absolutive DP raises to a position c-commanding other clausemate DPs, and applied objects may undergo optional scrambling to a position above the ergative agent.

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