Crossword Genius

Staff not easily moved? (5)

Ross

I believe the answer is:

stick

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'staff' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for stick that I've seen before include "Switch < put up" , "Baton; gum" , "See 2" , "Tolerate" , "Rod" .)

I've seen this clue in The Irish News.
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