Doors fan confused about variable emphasis playing music (9)

I believe the answer is:

sforzando

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'music' is the definition.
(sforzando is a kind of musical note)

'doors fan confused about variable' is the wordplay.
'confused' is an anagram indicator.
'about' is an insertion indicator.
'variable' becomes 'z' (algebra).
'doors'+'fan'='doorsfan'
'doorsfan' is an anagram of 'sforando'.
'sforando' placed around 'z' is 'SFORZANDO'.

'emphasis playing' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for sforzando that I've seen before include "suddenly emphatic" , "Given sudden emphasis" .)

I've seen this clue in The Telegraph.

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