Crossword Genius

Hidden, as a motive (8)

Ross

I believe the answer is:

ulterior

(Other definitions for ulterior that I've seen before include "Beneath the surface, being deliberately concealed" , "Hidden or undisclosed, perhaps motive" , "Not obvious or admitted - say motive" , "Intentionally concealed" , "Deliberately concealed, motive perhaps" .)

I've seen this clue in The Times and The Sunday Times.
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