One at the mercy of the latest trends? (7,6)

I believe the answer is:

fashion victim

(Other definitions for fashion victim that I've seen before include "Slavish follower of the latest styles" , "Slave to clothes labels" , "Exploited follower of the latest trends" , "Slavish trend follower" , "Someone hooked on the latest trends?" .)

I've seen this clue in The Guardian.

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