What does the cryptic crossword clue "References in Thai sure to require translation (8)" mean?

The definition is "References". The wordplay uses an anagram. anagram of THAI + SURE = THESAURI; definition: "References" The answer is Thesauri.

References in Thai sure to require translation (8)

Telegraph Prize Cryptic #3081 | 3 Down | 2020-11-08 flower