A different satellite? It’s the same one each time (3,4)
I believe the answer is:
new moon
'the same one each time' is the definition.
The answer and definition can be both related to time as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'a different satellite?' is the wordplay.
'a different' becomes 'new' (I've seen this in another clue).
'satellite?' becomes 'moon' (moon is a kind of satellite).
'new'+'moon'='NEW MOON'
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for new moon that I've seen before include "Earth's satellite when appearing as a narrow crescent" , "heavenly vision" , "Early lunar crescent" , "Heavenly crescent" , "Start of lunar cycle" .)