Crossword Genius

Temperamental nobhead cannot sit properly (10)

Ross

I believe the answer is:

inconstant

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'temperamental' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for inconstant that I've seen before include "Often changing" , "Variable, irregular" , "Fickle" .)

I've seen this clue in The Hindu.
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