Odd company in the outskirts of Sydney (6)
I believe the answer is:
screwy
'odd' is the definition.
(thesaurus)
'company in the outskirts of sydney' is the wordplay.
'company' becomes 'crew' (a group of people).
'in the' is an insertion indicator.
'outskirts of' says to hollow out the word (remove centre letters) (only letters on the outskirts).
'sydney' with its middle removed is 'sy'.
'crew' placed within 'sy' is 'SCREWY'.
(Other definitions for screwy that I've seen before include "weird" , "Odd, eccentric" , "like a prison officer?" , "Off one's rocker" , "Slightly mad" .)