Crossword Genius

Relative mostly needs caring when out of sorts (10)

Ross

I believe the answer is:

grandniece

I'm a little stuck... Click here to teach me more about this clue!

'relative' is the definition.
(grandniece is a kind of relative)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for grandniece that I've seen before include "Member of family" , "Relative" .)

I've seen this clue in The Times.
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