Excitement created by astronaut's landing (6)
I believe the answer is:
splash
'excitement' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for splash that I've seen before include "Accidentally get liquid on" , "Bright patch of colour; fall in drops" , "Spend freely or make wet" , "Prominent front page news story" , "Watery sound" .)