Special quality (1,6)

I believe the answer is:

x factor

'special quality' is the definition.
(X factor can mean star quality)

This is the entire clue.

(Other definitions for x factor that I've seen before include "Its judges hear appalling submissions" , "Magical 'something'" , "Noteworthy special quality" , "'Hard to define but important special property (1,6)'" , "Popular TV talent show" .)

I've seen this clue in The Sun.

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