What does the cryptic crossword clue "Everyone heading north on old lady's animal (5)" mean?

The definition is "animal". The wordplay uses a reversal. ALL (reversal="ALL") + MA (synonym="MA") = LLAMA; definition: "animal" The answer is LLAMA.

Everyone heading north on old lady's animal (5)

Times Cryptic #28945 | 22 Down | 2024-06-17 flower