Moving house? (6,4)
(Other definitions for mobile home that I've seen before include "Large caravan for permanent residence" , "Permanently-used caravan" , "Caravan maybe" , "House on wheels?" .)
'moving house?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
This is all the clue.
Can you help me to learn more?
(Other definitions for caravan that I've seen before include "House on wheels" , "Trailer with living quarters" , "Towable home" , "Towed accommodation" , "Camel train" .)