Crossword Genius

Scene and dubious claim about us — it creates mood (10,5)

Ross

I believe the answer is:

incidental music

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'it creates mood' is the definition.
The definition suggests a singular noun which matches the answer.

'scene and dubious claim about us' is the wordplay.
'scene' becomes 'incident' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'dubious' indicates an anagram.
'about' indicates putting letters inside.
'claim' is an anagram of 'almic'.
'almic' going around 'us' is 'almusic'.
'incident'+'almusic'='INCIDENTAL MUSIC'

Can you help me to learn more?

(Other definitions for incidental music that I've seen before include "Notes on film" , "that creates a mood" , "Background to a film or play" .)

I've seen this clue in The Independent.
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