Low point for satellite (4)
I believe the answer is:
moon
This clue is a double definition.
'low point' is the first definition.
(I've seen this before)
'for satellite' is the second definition.
(moon is a kind of satellite)
(Other definitions for moon that I've seen before include "Where Armstrong stood" , "Daydream - Europa of Jupiter, say" , "Natural satellite of a planet" , "Appear listless" , "High light" .)