Edit choral piece that's really long? (4)

I believe the answer is:

itch

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'really long?' is the definition.
'itch' can be an answer for 'long?' (I've seen this before). I am not sure about the 'really' bit.

'edit choral piece' is the wordplay.
'piece' indicates the answer is hidden within the clue.
'ITCH' is hidden within 'edit choral'.

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for itch that I've seen before include "Irritating pain" , "longing for something" , "Teasing desire" , "Prickle" , "Constant desire" .)

I've seen this clue in The Independent.

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