Pleasure boat's working day contributing to a record turnover (7)
I believe the answer is:
gondola
'pleasure boat's' is the definition.
(type of boat used in Venetian canals)
'working day contributing to a record turnover' is the wordplay.
I cannot quite see how this works, but
'working' could be 'on' (on can mean working or activated) and 'on' is found within the answer.
'day' could be 'd' (abbreviation for day) and 'd' is present in the answer.
'a' is within the answer.
This explanation may well be incorrect...
(Other definitions for gondola that I've seen before include "Goon lad (anag.)" , "Venetian boat - airship cabin" , "Boat on Venetian canals" , "Venetian canal boat" , "Palmieris' craft" .)