Tunnel man damaged, causing cancellation (9)
I believe the answer is:
annulment
'cancellation' is the definition.
(I've seen this before)
'tunnel man damaged' is the wordplay.
'damaged' indicates an anagram.
'tunnel'+'man'='tunnelman'
'tunnelman' anagrammed gives 'ANNULMENT'.
'causing' is the link.
(Other definitions for annulment that I've seen before include "cancellation" , "Declaration of invalidity, of a marriage say" , "dissolution" , "recall" , "Invalidation" .)