Motion picture released in time provided exposure for The Rock (7)

I believe the answer is:

outcrop

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'rock' is the definition.
(outcrop is a kind of rock)

I don't understand how the remainder of the clue works.

(Other definitions for outcrop that I've seen before include "Not suitable" , "Rock formation at the earth's surface" , "Exposed rock formation" , "rock appearance" , "Cop tour around projecting layer of rock" .)

I've seen this clue in the Irish Times.

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