"Undetermined" ulterior motives are finally shown in a different light (10)

I believe the answer is:

irresolute

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'undetermined' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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

I've seen this clue in The Independent.

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