Going right up in the air, is powerful (6)
I believe the answer is:
strong
'is powerful' is the definition.
(associated in meaning)
'going right up in the air' is the wordplay.
'going right' becomes 'rt' (abbreviation as in Rt Hon- the Right Honourable. I am not sure about the 'going' bit.).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'in' means one lot of letters goes inside another.
'the air' becomes 'song' (air can mean a piece of music).
'rt' backwards is 'tr'.
'tr' put within 'song' is 'STRONG'.
Can you help me to learn more?
(Other definitions for strong that I've seen before include "Solid" , "Resilient" , "muscular or concentrated" , "is excelling" , "Physically powerful - feel 1 Across" .)