7 down
Capital
of
Texas
initially
thanks
Washington
(6)
Capital of Texas initially thanks Washington (6)
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The definition is at the beginning of the clue.
How the clue works
Look at Capital — that's your definition, pointing you to the capital city of Canada. For the wordplay, you take the initial letters of Of Texas to get OT, then thanks gives you TA, and Washington is abbreviated to WA, and you just stack them up: OT, TA, WA.