Witches' longing (4)

I believe the answer is:

itch

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'longing' is the definition.
(itch can mean a desire or longing)

'witches'' is the wordplay.
'ITCH' is hidden in amongst the letters.
But, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for itch that I've seen before include "Seven-yearly desire" , "following seven years in union?" , "Irritating feeling on the skin" , "Slight irritation" , "Hankering" .)

I've seen this clue in The Mirror.

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