Inflation should hold this up (3-3,7)
I believe the answer is:
hot-air balloon
'inflation should hold this up' is the definition.
The definition suggests a singular noun which matches the answer.
This is the entire clue.
Can you help me to learn more?
(Other definitions for hot-air balloon that I've seen before include "Flame-powered craft" , "Aerial transport" , "Craft using heat to gain altitude" , "Basket lifter" , "Lighter-than-air craft" .)