Crossword Genius

Brief musical opening (5)

Ross

I believe the answer is:

intro

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This might be a double definition.

'brief' is the first definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'musical opening' is the second definition.
(short for introduction)

Can you help me to learn more?

(Other definitions for intro that I've seen before include "Lead-in" , "First part of a news story (abbr)" , "Preliminary part" , "Lead" , "Opening passage (of music) (colloq.)" .)

I've seen this clue in The Mirror.
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