Lucky devil on a trip abroad (12)
I believe the answer is:
providential
'lucky' is the definition.
(I've seen this before)
'devil on a trip abroad' is the wordplay.
'abroad' indicates anagramming the letters.
'devil'+'on'+'a'+'trip'='devilonatrip'
'devilonatrip' is an anagram of 'PROVIDENTIAL'.
(Other definitions for providential that I've seen before include "Unexpectedly fortunate (as if arranged by God)" , "Lucky" , "Very opportune" .)