What does the cryptic crossword clue "4s perhaps jammed by core of Martians' signals (7)" mean?

The definition is "s igna ls". The wordplay uses a container (one word inside another). TI (synonym="ans") in MOONS (synonym="MOONS") = MOTIONS; definition: "signals" The answer is MOTIONS.

4s perhaps jammed by core of Martians' signals (7)

Independent Cryptic #11842 | 21 Across | 2024-09-23 flower

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