Pain of blindworms on top of house (7)

I believe the answer is:

anguish

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'pain' is the definition.
(anguish is pain or suffering)

'of blindworms on top of house' is the wordplay.
'of blindworms' becomes 'anguis' (I can't explain this - if you can you should give a lot more credence to this answer).
'on top of' indicates taking the first letters.
The first letter of 'house' is 'h'.
'anguis'+'h'='ANGUISH'

Can you help me to learn more?

(Other definitions for anguish that I've seen before include "Extreme torment" , "Great (mental) pain" , "Severe mental suffering" , "Grief" , "Angst" .)

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

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