Low satellite that's waned (3)
I believe the answer is:
moo
'low' is the definition.
(both can mean to make the noise of a cow)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for moo that I've seen before include "Cow's low" , "Irritating woman" , "Cow's call" , "Guernsey noise?" , "unpopular woman" .)