Crossword Genius

Frivolous extras like percussion and wind instruments (5,3,8)

Ross

I believe the answer is:

bells and whistles

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'frivolous extras like percussion and wind instruments' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'percussion and wind instruments' is the wordplay.
'percussion' becomes 'bells' (I am not sure about this - if you are sure you should believe this answer much more).
'wind instruments' becomes 'whistles' (whistle is a kind of wind instrument).
'bells'+'and'+'whistles'='BELLS AND WHISTLES'

Can you help me to learn more?

(Other definitions for bells and whistles that I've seen before include "the basic model may be lacking" , "Sound warnings" .)

I've seen this clue in the Sydney Morning Herald.
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