Seen in a cryptic crossword (Metro, 9th May):
Continental stagecoach industry [9]
The answer is
DILIGENCE
but why?
In Europe, stagecoaches were referred to as
The industry part might be a reference to its adjective form industrious, which is synonymous with diligent. Going back to the noun form leads us to
DILIGENCE. Check Google's list of synonyms for industrious here.