Hurt when semi-unattached (5)

I believe the answer is:

ached

I'm a little stuck... Click here to teach me more about this clue!

'hurt' is the definition.
(I've seen this in another clue)

'semi-unattached' is the wordplay.
'ACHED' is hidden within the letters.
However, I'm not sure how this is indicated.

'when' acts as a link.

Can you help me to learn more?

(Other definitions for ached that I've seen before include "suffered" , "Throbbed" , "Yearned" , "caused discomfort" , "Felt a dull pain" .)

I've seen this clue in the Sydney Morning Herald.

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