What does the cryptic crossword clue "Frodo urgently conceals what may be detected (5)" mean?

The definition is "what may be detected". The wordplay uses a hidden word. hidden in fr ODO UR gently The answer is ODOUR.

Frodo urgently conceals what may be detected (5)

Independent Cryptic #11698 | 24 Down | 2024-04-08 flower