Crossword Genius

Source of a drama in history (6)

Ross

I believe the answer is:

armada

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'history' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'source of a drama' is the wordplay.
'source of' indicates an anagram.
'a'+'drama'='adrama'
'adrama' anagrammed gives 'ARMADA'.

'in' is the link.

Can you help me to learn more?

(Other definitions for armada that I've seen before include "sea-borne unit" , "The Spanish force" , "Large flotilla" , "Large number of ships (Spanish?)" , "Fleet of armed ships" .)

I've seen this clue in the Evening Standard.
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