Crossword Genius

One's continually upset to some extent (4)

Ross

I believe the answer is:

unit

'one's' is the definition.
(synonyms)

'continually upset to some extent' is the wordplay.
'to some extent' indicates the answer is hidden within the clue.
'upset' is a reversal indicator.
'tinu' is hidden in the letters of 'continually'.
'tinu' back-to-front is 'UNIT'.

(Other definitions for unit that I've seen before include "Self-contained part" , "One; military group" , "- - trust" , "Mexican maize pancake" , "Body of soldiers" .)

I've seen this clue in The Guardian.
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