Crossword Genius

... set off, all upset to see girl (6)

Ross

I believe the answer is:

stella

'girl' is the definition.

'set off all upset' is the wordplay.
'off' indicates anagramming the letters.
'upset' says the letters should be written backwards.
'all' back-to-front is 'lla'.
'set' is an anagram of 'ste'.
'ste'+'lla'='STELLA'

'to see' acts as a link.

(Other definitions for stella that I've seen before include "Paul McCartney's daughter" , "Girl's name meaning star" , "lady?" , "woman" , "girl!" .)

I've seen this clue in The Telegraph.
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