Dull: outside windy (7)
I believe the answer is:
tedious
'dull' is the definition.
(similar in meaning)
'outside windy' is the wordplay.
'windy' is an anagram indicator (windy suggests disruption).
'outside' anagrammed gives 'TEDIOUS'.
(Other definitions for tedious that I've seen before include "Long, slow, dull" , "not worth listening to?" , "awfully boring" , "Outside (anag.)" , "Humdrum" .)