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Go-getter husband headed off cattle thief (7)

Ross

I believe the answer is:

hustler

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'go-getter' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for hustler that I've seen before include "Illicit dealer (mainly US)" , "Energetic or crooked operator" , "Aggressive seller" , "Aggressive dealer" , "The slur (anag)" .)

I've seen this clue in the Sydney Morning Herald.
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