Good money abroad? Excellent! (5)
I believe the answer is:
grand
'excellent' is the definition.
(thesaurus)
'good money abroad?' is the wordplay.
'good' becomes 'g' (abbreviation).
'money abroad?' becomes 'rand' (currency of South Africa).
'g'+'rand'='GRAND'
(Other definitions for grand that I've seen before include "principal" , "Impressive, large" , "A slangy PS1,000" , "Magnificent, imposing" , "Fine" .)