Potentially serious challengers from movement censored over good books (10)
I believe the answer is:
contenders
'potentially serious challengers' is the definition.
'contenders' can be an answer for 'challengers' ('contender' can be a synonym of 'challenger'). I am unsure of the 'potentially serious' bit.
'movement censored over good books' is the wordplay.
I cannot really understand how this works, but
'over' could be 'on' (I've seen this in other clues) and 'on' is found in the answer.
This explanation may well be incorrect...
'from' is the link.
Can you help me to learn more?
(Other definitions for contenders that I've seen before include "candidacy?" , "Campaigners" .)