Ingrid's "Casablanca" role (4)

I believe the answer is:

ilsa

'ingrid's casablanca role' is the definition.
(I've seen this in another clue)

This is all the clue.

(Another definition for ilsa that I've seen is " Heroine of film Casablanca; sail (anagram)".)

I've seen this clue in the Universal and The Wall Street Journal.

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