Boat taking 500 in choppy lagoon (7)
I believe the answer is:
gondola
'boat' is the definition.
(I know that gondola is a type of boat)
'500 in choppy lagoon' is the wordplay.
'500' becomes 'D' (Roman numeral for 500).
'in' is an insertion indicator.
'choppy' indicates anagramming the letters (choppy implies disruption).
'lagoon' anagrammed gives 'gonola'.
'd' placed into 'gonola' is 'GONDOLA'.
'taking' is the link.
(Other definitions for gondola that I've seen before include "Venetian vessel" , "Venetian taxi" , "Boats on the canals of Venice" , "Shop unit" , "narrow boat" .)