Strange start to burglary with no alarm going off outside (8)
I believe the answer is:
abnormal
'strange' is the definition.
(I've seen this before)
'start to burglary with no alarm going off outside' is the wordplay.
'start to' indicates taking the first letters.
'with' says to put letters next to each other.
'going off' is an anagram indicator.
'outside' is an insertion indicator.
The first letter of 'burglary' is 'b'.
'alarm' anagrammed gives 'armal'.
'b'+'no'='bno'
'bno' placed inside 'armal' is 'ABNORMAL'.
(Other definitions for abnormal that I've seen before include "Anomalous" , "Odd" , "Moral ban (anag.)" , "Exceptional; strange" , "Irregular" .)