It relieves pain of destroying pub on fire (9)

I believe the answer is:

ibuprofen

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'it relieves pain' is the definition.
The definition suggests a singular noun which matches the answer.

'destroying pub on fire' is the wordplay.
'destroying' is an anagram indicator.
'pub'+'on'+'fire'='pubonfire'
'pubonfire' with letters rearranged gives 'IBUPROFEN'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for ibuprofen that I've seen before include "Drug" , "Anti-inflammatory medicine" , "anaesthetic" , "Painkiller" .)

I've seen this clue in The Irish Times.

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