Red sconce used in build-up (9)

I believe the answer is:

crescendo

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'up' is the definition.
(thesaurus)

'red sconce used' is the wordplay.
'used' indicates anagramming the letters.
'red'+'sconce'='redsconce'
'redsconce' with letters rearranged gives 'CRESCENDO'.

'in build' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for crescendo that I've seen before include "Gradual increase in loudness, musically" , "Rising noise" , "Increase of volume in music" , "Conceders (anag.)" , "Intensify" .)

I've seen this clue in The Daily Express.

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