Crossword Genius

But never take off a heartless lady! (4)

Ross

I believe the answer is:

only

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'but' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

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(Other definitions for only that I've seen before include "Mere" , ". . . . the Lonely (sung by Roy Orbison)" , "Simply" , "Existing alone with no other, perhaps a child" , "See 6" .)

I've seen this clue in the Evening Standard.
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