Try to refit an old boat (7)
I believe the answer is:
gondola
'boat' is the definition.
(I know that gondola is a type of boat)
'try to refit an old' is the wordplay.
'try' becomes 'go' (both can mean an attempt).
'to refit' indicates anagramming the letters (I've seen 'refitting' mean this).
'an'+'old'='anold'
'anold' with letters rearranged gives 'ndola'.
'go'+'ndola'='GONDOLA'
(Other definitions for gondola that I've seen before include "Compartment suspended from an airship" , "Boat on Venetian canals" , "It's traditionally used on the canals of Venice" , "Traditional boat of Venice" , "Venice craft" .)