"Inside Out" protagonist (5)

I believe the answer is:

riley

(Other definitions for riley that I've seen before include "figuratively associated with 16 [THE GOOD LIFE] ?" , "The life of - is luxurious" , "Op art painter" , "The life of --- is carefree" , "22/26 [COUNTDOWN] number-cruncher" .)

I've seen this clue in the Universal.

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