Crossword Genius

E.g. James Stuart, an indulger in make-believe? (9)

Ross

I believe the answer is:

pretender

'indulger in make-believe?' is the definition.
(someone who pretends)

I cannot understand how the remainder of the clue works.

(Other definitions for pretender that I've seen before include "fake" , "Claimant to a throne, usually without just title" , "One claiming a title" , "Claimant, like Bonnie Prince Charlie" , "One who claims a title or position" .)

I've seen this clue in The Times.
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