Crossword Genius

Trade knight for rook in plot that's set up for provocation (3,3)

Ross

I believe the answer is:

red rag

I'm a little stuck... Click here to teach me more about this clue!

'provocation' is the definition.
Both the definition and answer are singular nouns.
I also know that 'provocation' relates to this answer.

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

Can you help me to learn more?

(Other definitions for red rag that I've seen before include "might attract a charge" , "Gerard (anag) - cause of infuriation" , "Proverbial bull enrager" , "Reputed to annoy bull" , "Bull incitor?" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app