What does the cryptic crossword clue "Animal research facility upset about mating period (6)" mean?

The definition is "Animal". The wordplay uses an anagram. anagram of RUT (synonym="‘mating period’") + BAL (synonym="BAL") = BRUTAL; definition: "Animal" The answer is BRUTAL.

Animal research facility upset about mating period (6)

Guardian Cryptic #29475 | 1 Across | 2024-08-30 flower

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