Goes off side in a pleasure boat (6,7)
I believe the answer is:
paddle steamer
'pleasure boat' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'goes off side in a' is the wordplay.
'goes off' becomes 'addles' (I can't explain this - if you can you should believe this answer much more).
'side' becomes 'team' (a side is a sporting team).
'in' means one lot of letters goes inside another.
'a' becomes 'per' (eg 'one a day' means 'one per day').
'addles'+'team'='addlesteam'
'addlesteam' put within 'per' is 'PADDLE-STEAMER'.
Can you help me to learn more?
(Other definitions for paddle steamer that I've seen before include "Ship propelled by bladed wheels" , "Type of ship" , "River boat, for example" , "Mississippi boat?" , "vessel" .)