Is one surrounded by fish in the country? (7)
I believe the answer is:
tunisia
'country?' is the definition.
(Tunisia is an example)
'is one surrounded by fish' is the wordplay.
'one' becomes 'i' (Roman numeral).
'surrounded by' means one lot of letters goes inside another.
'fish' becomes 'tuna' (tuna is a kind of fish**).
'is'+'i'='isi'
'isi' going within 'tuna' is 'TUNISIA'.
'in the' is the link.
(Other definitions for tunisia that I've seen before include "North African republic" , "Somewhere in North Africa" , "Suit Ian to be in North African country" , "Country where Carthage is found" , "As Inuit visits there in North Africa" .)