Motor home’s grand, a trendy thing (6)
I believe the answer is:
garage
'motor home's' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'grand a trendy thing' is the wordplay.
'grand' becomes 'g' (G is short for grand as in a thousand).
'trendy thing' becomes 'rage' (I can't explain this - if you can you should give a lot more credence to this answer).
'g'+'a'+'rage'='GARAGE'
Can you help me to learn more?
(Other definitions for garage that I've seen before include "Car shed" , "Petrol pump location" , "Structure for automobiles" , "Building for a car, or for its maintenance" , "Car repair shop" .)