Damage is due to boring (7)
I believe the answer is:
tedious
'boring' is the definition.
(I know that boring can be written as tedious)
'damage is due to' is the wordplay.
'damage' indicates anagramming the letters (I've seen this in other clues).
'is'+'due'+'to'='isdueto'
'isdueto' is an anagram of 'TEDIOUS'.
(Other definitions for tedious that I've seen before include "Humdrum" , "Long, slow, dull" , "Dull as ditchwater" , "Boring, monotonous" , "awfully boring" .)