Avid concert-goer finds second and third movements clumsier, surprisingly (5-5)

I believe the answer is:

music-lover

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'avid concert-goer' is the definition.
'music lover' can be an answer for 'concert-goer' (synonyms). I am not certain of the 'avid' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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