Plenty of luggage (4)
I believe the answer is:
bags
This clue is a double definition.
'plenty' is the first definition.
(I've seen this before)
'luggage' is the second definition.
(I've seen this in another clue)
'of' acts as a link.
(Other definitions for bags that I've seen before include "Flexible container" , "Items of luggage" , "I claim" , "strides?" , "Criticises" .)