Shakespeare character for whom "the quality of mercy is not strain'd”? (6)

I believe the answer is:

portia

(Other definitions for portia that I've seen before include "Theatrical "lawyer"" , "rich heiress" , "She opposed Shylock" , "Heiress of The Merchant of Venice" , "Character in "Julius Caesar" or "The Merchant of Venice"" .)

I've seen this clue in The Guardian.

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