Crossword Genius

Deep-seated; persistent (7)

Ross

I believe the answer is:

chronic

This clue is a double definition.

'deep-seated' is the first definition.
(thesaurus)

'persistent' is the second definition.
(a chronic condition is a persistent one)

(Other definitions for chronic that I've seen before include "pants" , "(Of illness) lengthy; very bad (colloq.)" , "Of illness, prolonged or constantly recurring" , "Very serious" , "Not acute" .)

I've seen this clue in The Times.
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