Crossword Genius

Niece slept badly, getting sickness (10)

Ross

I believe the answer is:

pestilence

'sickness' is the definition.
(pestilence is a kind of sickness)

'niece slept badly' is the wordplay.
'badly' indicates anagramming the letters.
'niece'+'slept'='nieceslept'
'nieceslept' is an anagram of 'PESTILENCE'.

'getting' is the link.

(Other definitions for pestilence that I've seen before include "Plague - lent pieces (anag)" , "dire horseman?" , "Fatal epidemic disease" , "that'll plague you" , "Epidemic disease with a high death rate" .)

I've seen this clue in The Telegraph.
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