By itself something said to attract interest (5)

I believe the answer is:

alone

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

I can't explain the remainder of the clue.

(Other definitions for alone that I've seen before include "Lacking company, solitary" , "Single" , "without another" , "Isolated; exclusively" , "Without others being involved" .)

I've seen this clue in The Globe and Mail.

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