You can paddle it back again (5)
I believe the answer is:
kayak
'back again' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'you can paddle it' is the wordplay.
I cannot really see how this works, but
'you' could be 'ya' (non-standard spelling as in 'see ya later') and 'ya' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for kayak that I've seen before include "Arctic canoe" , "Inuit craft" , "Palindromic canoe used by eskimos" , "Inuit's light canoe" , "Small canoe with a light frame" .)