Horrible pain sir? Take this (7)

I believe the answer is:

aspirin

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'horrible pain sir? take this' is the definition.
The definition suggests a singular noun which matches the answer. I also know that 'pain' relates to this answer.

'horrible pain sir?' is the wordplay.
'horrible' indicates anagramming the letters.
'pain'+'sir'='painsir'
'painsir' is an anagram of 'ASPIRIN'.

Can you help me to learn more?

(Other definitions for aspirin that I've seen before include "Synthetic analgesic" , "Anodyne" , "answer to pain?" , "Analgesic over in Paris" , "Sip rain (anag.)" .)

I've seen this clue in The Sun.

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