Extremely shady politician chases darling ignoring wife at last in arrangement (8)

I believe the answer is:

symphony

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But I can't explain it at all! Could you help me understand?

(Other definitions for symphony that I've seen before include "Grand orchestral composition" , "Large orchestral work" , "Musical composition" , "Large orchestral piece" , "Eg, the Eroica" .)

I've seen this clue in The Hindu.

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