Moral evil of the Spanish Armada (4)

I believe the answer is:

harm

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

'moral evil' is the definition.
'harm' can be an answer for 'evil' (thesaurus). I'm not certain of the 'moral' bit.

'of the spanish armada' is the wordplay.
'of' says the answer is hidden in the clue.
'HARM' is hidden in the letters of 'the spanish armada'.

Can you help me to learn more?

(Other definitions for harm that I've seen before include "Hurt, maim" , "Injure or damage" , "Trials, exams" , "Short-long metric feet" , "Wound" .)

I've seen this clue in the Evening Standard.

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