Witches' longing (4)

I believe the answer is:

itch

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'longing' is the definition.
(I've seen this before)

'witches'' is the wordplay.
'ITCH' is hidden within the letters.
However, I'm not sure how this 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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