Frodo urgently conceals what may be detected (5)

I believe the answer is:

odour

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'may be detected' is the definition.
I can't tell whether this definition defines the answer.

'frodo urgently conceals' is the wordplay.
'conceals' indicates a hidden word.
'ODOUR' is hidden within 'frodo urgently'.

'what' acts as a link.

Can you help me to learn more?

(Other definitions for odour that I've seen before include "Smell, redolence" , "Small, aroma" , "Stench" , "Olfactory sensation" , "essence" .)

I've seen this clue in The Independent.

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