Source of a drama in history (6)
I believe the answer is:
armada
'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" .)