Would a moored houseboat be one? (5,5)

'moored houseboat be one?' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'would a' is the wordplay.
I cannot really understand how this works, but
'would' could be 'd' (as in 'we'd' - 'we would') and 'd' is found in the answer.
'a' 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?