Crossword Genius

Likely heir to endless suffering (6,3)

Ross

I believe the answer is:

eldest son

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'likely heir' is the definition.
I know nothing about this answer so I can't judge whether this works.

'to endless suffering' is the wordplay.
'suffering' indicates an anagram.
'to'+'endless'='toendless'
'toendless' is an anagram of 'ELDEST SON'.

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I've seen this clue in The Sunday Times.
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