One goes on hot-air balloon and glows, primarily (6)
I believe the answer is:
gasbag
'one' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'hot-air balloon and glows primarily' is the wordplay.
'hot air' becomes 'gas' (I've seen this in another clue).
'primarily' says to take the initial letters.
The first letters of 'balloon and glows' is 'bag'.
'gas'+'bag'='GASBAG'
'goes on' is the link.
Can you help me to learn more?
(Other definitions for gasbag that I've seen before include "This can be elevating" , "Prattler" , "One who talks too much, or a balloon" , "Talkative type" , "I talk too much" .)