Dithering Tories' rule vacillating (10)

I believe the answer is:

irresolute

'vacillating' is the definition.
('irresolute' can be similar in meaning to 'vacillating')

'dithering tories' rule' is the wordplay.
'dithering' is an anagram indicator.
'tories'+'rule'='toriesrule'
'toriesrule' with letters rearranged gives 'IRRESOLUTE'.

(Other definitions for irresolute that I've seen before include "Hesitating" , "lacking clear purpose" , "Hesitant, uncertain" , "Indecisive" .)

I've seen this clue in The Telegraph.

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