Troublemaker in small company turning to setter over way forward? (9)
I believe the answer is:
sociopath
'troublemaker' is the definition.
'small company turning to setter over way forward?' is the wordplay.
'small company turning' becomes 'soc' (I can't explain this - if you can you should believe this answer much more).
'to setter' becomes 'i' (the person that set the crossword).
'over' becomes 'o' (cricket abbreviation).
'way forward?' becomes 'path'.
'soc'+'i'+'o'+'path'='SOCIOPATH'
'in' acts as a link.
(Other definitions for sociopath that I've seen before include "dangerous individual" , "Psycho" , "Antisocial being" , "One who's disturbed" .)