Crossword Genius

Humanitarian organisation's driver possibly going round in circles (6,4)

Ross

I believe the answer is:

rotary club

'humanitarian organisation's' is the definition.

I don't understand how the remainder of the clue works.

(Other definitions for rotary club that I've seen before include "charitable combination" , "Branch of a worldwide charitable society of professional types" .)

I've seen this clue in The Guardian.
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