Unknown element in TV show (1,6)
I believe the answer is:
x factor
'unknown element' is the definition.
(I've seen this in another clue)
'tv show' is the wordplay.
I cannot quite see how this works, but
'show' could be 'act' (act is a kind of show) and 'act' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'in' is the link.
Can you help me to learn more?
(Other definitions for x factor that I've seen before include "Magical 'something'" , "Noteworthy special talent" , "Its judges hear appalling submissions" , "'Hard to define but important special property (1,6)'" , "Indefinable special quality" .)