What does the cryptic crossword clue "Hard branch of maths? On reflection, it's the circumference (5)" mean?

The definition is "circumference". The wordplay uses a reversal. TRIG (reversal="branch of maths") + H (synonym="hard") = GIRTH; definition: "circumference" The answer is GIRTH.

Hard branch of maths? On reflection, it's the circumference (5)

Times Cryptic #28910 | 17 Across | 2024-05-07 flower

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