Crossword Genius

But not exactly oily (4)

Ross

I believe the answer is:

only

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'but' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for only that I've seen before include "Single, solitary" , ". . . . the Lonely (sung by Roy Orbison)" , "Except that; single" , "Mere" , "Solely, lone" .)

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