A girl in the outskirts of Bristol? That's odd! (8)
I believe the answer is:
abnormal
'that's odd' is the definition.
(I've seen this in another clue)
'a girl in the outskirts of bristol?' is the wordplay.
'girl' becomes 'norma' ().
'in the' indicates putting letters inside.
'outskirts of' suggests removing the centre (only letters on the outskirts).
'bristol' with its centre removed is 'bl'.
'norma' going into 'bl' is 'bnormal'.
'a'+'bnormal'='ABNORMAL'
(Other definitions for abnormal that I've seen before include "Deviating from the usual" , "Deviant or unnatural" , "Different to what is ordinary or expected" , "The reverse of 32 Across" , "'Aberrant, atypical (8)'" .)