There's nothing fine in yobbo, causing concern (7)
I believe the answer is:
lookout
'concern' is the definition.
(thesaurus)
'there's nothing fine in yobbo' is the wordplay.
'there's nothing' becomes 'o' (I've seen this in other clues).
'fine' becomes 'ok' ('OK' can be a synonym of 'fine').
'in' is an insertion indicator.
'yobbo' becomes 'lout' (I've seen this before).
'o'+'ok'='ook'
'ook' placed into 'lout' is 'LOOKOUT'.
'causing' acts as a link.
(Other definitions for lookout that I've seen before include "Vantage point" , "View" , "Person in the crow's nest" , "Observer; concern" , "Watching person" .)