Right again!

Head south after Falkland Islands, then about left, go commercial (6)

Falkland Islands [abbr] FI

head south [abbr] S

after [position indicator] … S goes after FI => FIS

about [abbr] ca

left go [abbr] L

   -> FIScaL

WHOLE DEFINITION 

commercial = fiscal

Over to you, twyngwyn.