Crossword Genius

Possibly the deep ulterior motive (3)

Ross

I believe the answer is:

end

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'motive' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for end that I've seen before include "Closure" , "Unyielding" , "Extreme" , "Remainder" , "Goal; leftover" .)

I've seen this clue in the Evening Standard.
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