What does the cryptic crossword clue "Some Zulus travel for five year periods (6)" mean?

The definition is "five year periods". The wordplay uses a hidden word. LUSTRA ( hidden word [some] in ZU LUS TRA VEL) The answer is LUSTRA.

Some Zulus travel for five year periods (6)

Independent Cryptic #11791 | 22 Down | 2024-07-25 flower