Crossword Genius

This person's going to trouble (3)

Ross

I believe the answer is:

ill

'trouble' is the definition.
(synonyms)

'this person's going to' is the wordplay.
'this person' becomes 'I'.
'going to' becomes 'll' (as in he'll, we'll etc).
'i'+'ll'='ILL'

(Other definitions for ill that I've seen before include "Unhealthy" , "Out of sorts" , "weak" , "Shakespeare: '. . . met by moonlight'" , "Evil or sick" .)

I've seen this clue in The Times.
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