Not that favourite trumpet piece? How odd! (3)

I believe the answer is:

rum

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'odd' is the definition.
(rum can mean strange or dubious)

'not that favourite trumpet piece?' is the wordplay.
'RUM' is hidden in amongst the letters.
However, I am not sure how the hidden word is indicated.

'how' acts as a link.

Can you help me to learn more?

(Other definitions for rum that I've seen before include "Odd sort of spirit used in grog" , "Droll" , "Eerie" , "Odd like drink distilled from molasses" , "Unusual" .)

I've seen this clue in the Evening Standard.

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