Angry Mexican leads instead (7)

I believe the answer is:

steamed

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'angry' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for steamed that I've seen before include "Proceeded with course" , "Cooked over boiling water" , "Cooked in vapour" , "got really hot" , "cooked a certain way" .)

I've seen this clue in The Daily Express.

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