Peacekeepers clearing tense area of Tours goes wrong (8)
I believe the answer is:
unravels
'goes wrong' is the definition.
'peacekeepers clearing tense' is the wordplay.
'peacekeepers' becomes 'un'.
'clearing tense' becomes 'ravels' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'un'+'ravels'='UNRAVELS'
'area of tours' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for unravels that I've seen before include "Unpicks or disentangles" , "Disentangles or solves" , "Comes undone" .)