What does the cryptic crossword clue "Branch of science is obligatory and so complicated (12)" mean?

The definition is "Branch of science". The wordplay uses an anagram. anagram of OBLIGATORY + SO = ASTROBIOLOGY; definition: "Branch of science" The answer is ASTROBIOLOGY.

Branch of science is obligatory and so complicated (12)

Times Cryptic #29185 | 1 Across | 2025-03-24 flower

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