Fish from Asian country served in public house area (7)
I believe the answer is:
piranha
'fish' is the definition.
(piranha is a kind of fish)
'asian country served in public house area' is the wordplay.
'asian country' becomes 'Iran' (country in Asia).
'served in' indicates putting letters inside.
'public house' becomes 'ph'.
'area' becomes 'a' (maths abbreviation).
'iran' inserted inside 'ph' is 'piranh'.
'piranh'+'a'='PIRANHA'
'from' is the link.
(Other definitions for piranha that I've seen before include "Voracious river fish" , "This predator" , "Fierce small fish of the Amazon" , "Voracious tropical fish" , "fish chewed up" .)