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Helicopters dropping off richest staff (4)

Ross

I believe the answer is:

pole

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'staff' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for pole that I've seen before include "support" , "Rod; shaft; European" , "Heavenly body indicating north" , "Punt propeller" , "Native of Warsaw" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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