Vote in favour of adopting decree produces that certain something
I believe the answer is:
x factor
'that certain something' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'vote in favour of adopting decree' is the wordplay.
'vote' becomes 'x' (how votes are marked).
'in favour of' becomes 'for' (I've seen this before).
'adopting' means one lot of letters goes inside another.
'decree' becomes 'act' (I've seen this in other clues).
'for' placed around 'act' is 'factor'.
'x'+'factor'='X-FACTOR'
'produces' is the link.
Can you help me to learn more?
(Other definitions for x factor that I've seen before include "Noteworthy special quality" , "Indefinable special quality" , "Noteworthy special talent" , "Magical 'something'" , "Its judges hear appalling submissions" .)