Endless reporters certain to lead to tension (8)
I believe the answer is:
pressure
'tension' is the definition.
(thesaurus)
'endless reporters certain' is the wordplay.
'endless' means to remove the last letter.
'reporters' becomes 'press' (I've seen this before).
'certain' becomes 'sure' ('sure' can be a synonym of 'certain').
'press' with its final letter taken away is 'pres'.
'pres'+'sure'='PRESSURE'
'to lead to' is the link.
(Other definitions for pressure that I've seen before include "Coercion or forceful persuasion" , "Coercion, intimidation" , "A force that compels" , "Force, stress, strain" , "tension" .)