International in time becomes choice (6)
I believe the answer is:
dainty
'choice' is the definition.
(synonyms)
'international in time' is the wordplay.
'international' becomes 'int' (abbreviation for international).
'in' is an insertion indicator.
'time' becomes 'day' (day is a kind of time).
'int' placed within 'day' is 'DAINTY'.
'becomes' acts as a link.
(Other definitions for dainty that I've seen before include "Delicate, tasteful" , "Delicate and petite" , "Twee" , "Fastidious" , "Small and pretty, delicate" .)