An example of luggage? (4)
I believe the answer is:
case
I believe this clue is a double definition.
'an example' is the first definition.
(case can mean an example or instance of something)
'luggage?' is the second definition.
(luggage is a kind of case)
'of' acts as a link.
(Other definitions for case that I've seen before include "condition" , "Detective work" , "See 12" , "baggage item" , "proceedings" .)