Crossword Genius

Co-ordinated Spanish warrior's offensive (6)

Ross

I believe the answer is:

rancid

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

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

Can you help me to learn more?

(Other definitions for rancid that I've seen before include "Unpleasantly stale" , "Putrid" , "Smelling bad like stale fat" , "Rank-smelling." , "Sour like stale grease 96)" .)

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