Next in line (4)

I think it could be either:

Which length description are you looking for?:

2,4

heir

'next in line?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for heir that I've seen before include "Expected successor" , "Natural successor" , "Someone expected to inherit" , "One who inherits" , "One expected to succeed?" .)

I've seen this clue in The New York Times, the Newsday, the Universal, The Guardian and the LA Times.

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