The untidy part left again? It's charming! (5)

I believe the answer is:

idyll

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'again? it's charming' is the definition.
I can't judge whether this definition defines the answer.

'the untidy part left' is the wordplay.
'the untidy part' becomes 'idyl' (I can't justify this - if you can you should believe this answer much more).
'left' becomes 'l' (common abbreviation).
'idyl'+'l'='IDYLL'

Can you help me to learn more?

(Other definitions for idyll that I've seen before include "Poem describing pastoral scenes" , "Poem descriptive of pastoral life" , "Simple story" , "very happy situation" , "rural image" .)

I've seen this clue in the Evening Standard.

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