International trade standard (5)
I believe the answer is:
ideal
'standard' is the definition.
(thesaurus)
'international trade' is the wordplay.
'international' becomes 'i' (abbreviation eg in IMF).
'trade' becomes 'deal' ('deal' can be a synonym of 'trade').
'i'+'deal'='IDEAL'
(Other definitions for ideal that I've seen before include "Perfect for the purpose" , "Exemplar" , "immaculate" , "Standard of perfection or excellence" , "highly desirable" .)