Wanders listlessly, very keen for space travel (8)
I believe the answer is:
moonshot
'wanders listlessly very' is the definition.
I can't judge whether this definition defines the answer.
'keen for space travel' is the wordplay.
'keen' becomes 'hot' (I've seen this in other clues).
'for' means one lot of letters go next to another (I've seen this in other clues).
'space travel' becomes 'moons' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hot' put after 'moons' is 'MOONSHOT'.
Can you help me to learn more?
(Other definitions for moonshot that I've seen before include "Launch of spacecraft to Earth's near neighbour" , "Rocket launch to our nearest neighbour" , "Space flight" , "Launching of a lunar spacecraft" , "Ambitious launch" .)