State of affairs peculiar to Tunisia (9)
I believe the answer is:
situation
'state of affairs' is the definition.
(synonyms)
'peculiar to tunisia' is the wordplay.
'peculiar' indicates an anagram (a peculiar or strange ordering of the letters).
'to'+'tunisia'='totunisia'
'totunisia' anagrammed gives 'SITUATION'.
(Other definitions for situation that I've seen before include "Placement" , "spot" , "See 6" , "State of affairs -- job" , "Place" .)