Crossword Genius

Rank “two star”, being most pessimistic (2,5)

Ross

I believe the answer is:

at worst

'being most pessimistic' is the definition.
(in the most pessimistic scenario)

'rank two star' is the wordplay.
'rank' indicates anagramming the letters.
'two'+'star'='twostar'
'twostar' with letters rearranged gives 'AT WORST'.

(Other definitions for at worst that I've seen before include "most pessimistically" , "Taking the most pessimistic view" , "In the most negative circumstances" , "Taking blackest view" , "in the most serious state" .)

I've seen this clue in The Times.
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